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? ? Perspective
FRIEDRICHA. KITTLER TRANSLATEDBY SARA OGGER
and the Book
Film and television, computer graphics, and virtual reality have, as we know, caused
images to run in ever faster sequences. Subsequently, a perhaps unwarranted
jubilation has governed the past century's media theories: Writing in general and the book in particular are said to have been played out, while the image, more
powerful and more able to unite humanity than ever, is reclaiming its ancient
birthright. It is this jubilation, or at least the diagnosis upon which it is based, that I would like to contest. My counterargument, in brief, is that the printed book has not simply been played out, but rather that this unique medium was what made
its own high-technological outdoing possible in the firstplace. This power, which in turn is probably the basis of all Europe's power, accrued to the book not because
of its printed words alone, but rather because of a union of media that, with tech-
nical precision, joined these words with printed images.
Media theorists, specifically Marshall McLuhan and, succeeding him, Vilem
Flusser, draw an absolute distinction between writing and the image that ulti-
mately rests on concepts of geometry. They contrast the linearity or one-dimen-
sionality of printed books with the irreducible two-dimensionality of images.
Simplifiedinthismanner,itisadistinctionthatmayholdtrueevenwhen computer
technology can model texts as strings, as it does today. But it suppresses the sim-
ple facts emphasized long ago and, not coincidentally, by a nouveau romancier, Michel Butor: the books used most often-the Bible, once upon a time, and today
more likely the telephone book-are certainly not read in a linear manner. There is a perfectly good reason for this situation. Though the lines of a book have looked linear since Gutenberg, the page of a book has been two-dimensional since
the Scholasticism of the twelfth century at the latest. 1Each paragraphand section, footnote and title plays across a surface whose two-dimensionality is no different from that of an image. The fact alone that Gutenberg, before using his technology of movable type in Mainz on Bibles and calendars, had practiced the same technol- ogy in Strasbourg for reproducible pictures of the saints indicates that this picto- riality is at the origin of the printing press, which itself is not much more than a sobered-up Rhine wine press. The other issue, continually underscored by Michael Giesecke, that Gutenberg's movable type was never intended for mass production
Grey Room 05, Fall 2001, pp. 38-53. ? 2001 Grey Room, Inc. and Massachusetts Institute of Technology 39
? as such, but rather was supposed to compete with the calligraphic elegance of
manuscript pages, also proves pictoriality as the goal of the printing press. 2
And yet the geometry of the Mainz letters differed from that of the Strasbourg
pictures of the saints. Unlike faces, "letters"-to speak with Sigmund Freud-"do
not occur in nature. "3Gutenberg's press required a geometry of surface, if only because everything depended on putting each individual letter in its place. Each lead letter was practically defined or situated by its right, left, top, and bottom neighbors. In this way each letter filled a gap that was already waiting for it. Letterpress, in its standardization of writing, just continued what the imported Indo-Arabic system of place values did to standardize numerals in the high mid- dle ages. Just as zero, a numeral completely unknown to the Greeks and Romans, put all the other numerals in their proper places, so did the naked spatium, poured into lead by Gutenberg and into verse by Mallarme, proceed with all the other letters. 4 Only with the possibility of replacing the spatium with any arbitrarylet- ter did the internal process known as "the ability to write" get transferred to the external process known as the "typesetter'scase. "Writingin the age of its technical reproducibility is a combinatorial system of standardized elements or characters, just as it was already a combinatorial system of discreet elements or letters since the early Greek vowel alphabet.
The Greeks' stocheia, or letters, were not just the source of the four elements of the ancient world and the one hundred-twenty elements of the atomic present. Elements was also the title of a book that, for two thousand years, provided Greeks, Arabs, and Europeans instruction in the axioms of geometry. The current scholarly enthusiasm for rediscovering images, bodies, and natures forgets all too readily that the elements exist only in groups, which is to say, in code systems. For this reason even Euclid's Elements turned out to be a different book when it first entered the galaxy of Gutenbergin 1482. None other than Regiomontanus, who had imported the new Arabic trigonometry to Europe and, even more relevantly, to Nuremberg, lent his scholarly support to subjecting Euclid's rediscovered geom- etry manuscript to the printing press. While Euclid had used but words to define phenomena such as the point, line, and plane, each axiom was, as of 1482, accom- panied by a print-technological definition: the point appears as a point, the line as a line, etc. , until even-or rather, precisely-mathematics became a "typograph-
ical" event (to use Sybille Kramer'sterm). 5 And if the endpoints of a line printed in this manner are further marked with letters, then the geometric figure has been assigned a name that makes it addressable in all its parts. All this seems self-evident for mathematical or technical drawings, but it shouldn't be in the least. "How greatly this page here resembles a thousand other pages, and how hard it is to be
40 Grey Room 05
Typecase showing the divided compartments for each character.
? flabbergasted at that! ": thus Hans Magnus Enzensberger begins a poem about Johann Gensfieisch zum Gutenberg. 6The same holds true for Regiomontanus, his printer,Ratolf,and scientific visualization in general. Whatstill mattersin European
history today, in its transition to computer-aided posthistory, are neither mass movements nor the gods of war,but ratherthe small-scale, unassuming play of signi- fiers, which nonetheless has shaken (in Lacan'swords) the "moorings of our Being. "
The first among Gutenberg's contemporaries to grasp mathematization, as it developed in the founding years of the printing press, was Leon Battista Alberti, the Florentine noble, architect, master fortress builder, painter, and mathemati- cian. 7 One fine day in 1462 or 1463 he went strolling, as he relates, in the Vatican gardens with a man named Dato. Dato was, by profession, as his evocative name
suggests, personal scribe to the Pope. As we know, all modern diplomacy had its origins in the private offices of secretaries or, rather, secret scribes of the Roman Curia and the Venetian Signoria. Alberti, though, was interested in the exact opposite of traditional cryptography. He remarked off-handedly, as the two were perambulating under Roman palms, that the man in Mainz was just now probably making ten copies of an ancient manuscript and thus saving it. That must have prompted the Papal cryptographerto reply that his tedious labor of replacing letter after letter with yet other letters would, alas, not be so easy to mechanize as print- ing presses or the printer's case. Whereupon Alberti took up his quill and com- posed a tract that to this day is the watershed of modern cryptography.
Ancient cryptography, developed by Julius Caesar and adopted by Augustus, was a simplistic game with the Latin alphabet. Both Caesars worked by displac- ing each letter one or more places, until, for example, A was B, B was C, and C was D-in the course of which it never occurred to the great Augustus that his let- ter game was a kind of modulus mathematics: X, the last letter of his alphabet, did not turn into A again, but rather an exceptional AA. 8 Alberti found codes of this simplicity, still prevalent in his day, to be but child's play. He merely counted the frequency of each letter in uncoded Latin or Italian texts and then compared them with the frequency of letters in the cryptogram. In other words: Alberti translated the principle of Gutenberg'sprinter's cases, which had to provide more lead char- acters for the frequently occurring letters than the rarer ones and so are always-
already letter frequency analyzers, straight into cryptoanalysis.
He then applied this principle to cryptography,or encoding. Tooutdo the simple code bearing Caesar'sname, Alberti constructed two concentric rings, each inscribed with differently scrambled alphabets, so that a turn of the outer ring changed the correspondence between the two alphabets. Consequently, the privy scribe had
only to read the current correspondence and write it down, then turn the outer ring Kittler I Perspective and the Book 41
? another space. The tedious labor of Dato and his peers became, once again strictly as a consequence of Gutenberg, literally a mechanics of movable characters. Thus Leon Battista Alberti pursued his conversation in Rome to its logical conclusion:
with letter frequency analysis for decoding and a polyalphabetic key for encoding, he bestowed upon modern Europe the principle-or better, power-of its strate- gic secrets.
Even "The Life of the Florentine Architect Leone Battista Alberti," as Giorgio
Vasari titled his 1570 biography of Alberti, already suggested a parallel between
Gutenberg and Alberti-though, surprisingly enough, not between the printing
press and cryptography but between the printing press and linear perspective. Vasari states:
In the year 1457, when the very useful method of printing books was discov- ered by JohannGutenbergthe German,Leon Batista [sic], working on similar
lines, discovered a way of tracing natural perspectives and of effecting the diminution of figures by means of an instrument, and likewise the method
of enlarging small things and reproducing them on a greater scale; all inge- nious inventions, useful to art and very beautiful. 9
Precisely because he dated Gutenberg'saccomplishment ten years too late, Vasari's mission seems to pander to an early-modern brand of local patriotism: an "art"
that Germany had bestowed upon modernity is supposed to have been matched by Italy with a "similar" "art"in the same year. Now, what Vasari's ill-informed Alberti biography meant by that instrument, which sounds like Scheiner's panto- graph of two centuries later, remains an occluded mystery for the history of tech- nology. The scholarship assumes (on the basis of a second, anonymous Alberti biographer) that the alleged instrument for the magnification and reduction of images was in reality a camera obscura. "Alberti,"writes this biographer,
produced quite unbelievable things through paintings, which he had one look at through a narrow opening into a small box. There one saw the highest
mountains and faraway landscapes around the vast ocean, and regions so far
away from the eye, so distant, that one's power of vision was unable to dis-
tinguish them. He called these things demonstrations, and they were of a kind
such that persons whether experienced and inexperienced would think they were seeing not paintings, but the natural phenomena themselves. 10
Should the anonymous biographerdeserve more credit than Vasari,then Alberti's
demonstrations did exactly what this apocryphal pantograph did: they magnified distant objects and reduced close ones, entirely at the whim of a projection tech-
42 Grey Room 05
? nology that sent natural phenomena through the narrow aperture of a camera obscura. Alberti had thus replaced a craft, which painting was to remain at least until the invention of photography, with an optical media technology. The camera obscura-because it, even as a construction consisting of just an aperture and
projection wall, implements the linear-perspectival geometry of our seeing- created reproductions of the world exactly as free of copying errors as otherwise only Gutenberg's printed books were. This-it seems to me, at least-is the whole point of Vasari's German-Italian heroic saga.
The first edition of the Regensburg Missal of 1485 was praised by the clerics in
charge of its production as a "miracle of God. "The clerics had in fact, according
to Michael Giesecke, compared all the individual copies of the missal with its set-
ting copy, only to come to the conclusion that "in the letters, syllables, words,
sentences, periods, paragraphs and all attendant matters, the printing of all the
copies agrees, in every respect, with the setting copy. . . provided by our cathedral.
Forthis we must thank God. "11The "inexperienced" and "experienced"persons for whom Alberti's camera obscura projected the natural phenomena themselves in
place of paintings could not have been more amazed and delighted. Two simulta- neous technologies had appeared, poised to eliminate the disturbance of the human hand from texts and from images. In the same historical moment, books, and paint- ings entered the age of their technical, and thus noiseless, reproducibility.
It is no wonder, then, that both technologies of reproduction should melt into
a single one. The single geometry, as presented in the newborn printed edition of Euclid, became equally an element of text and image. None other than Alberti was
responsible for embarking upon this integration. In 1435, not quite ten years before Gutenberg's first Bible printing, Alberti's tract "On Painting," which would not
appear in print until 1540, appeared as a hand-written manuscript. This text not only transferreda form of knowledge, one that for centuries had been handed down through workshop conversations between masters and apprentices, to an autodi- dactic theory; it was also the first time the mute technology of linear perspective, or the camera obscura, was put to paper.
The first of Alberti's three "Books on Painting" appeared at the exact point where, later, the 1482 Euclid edition would begin: with the geometric definitions ofpoint,line,andplane. Itmisuses Greekmathematics,though,forapurposequite
unknown to antiquity: for the construction of linear-perspectival pictures. The three elements are only defined in order to convey a fourth, that is, the space of natural phenomena and buildings. Alberti's tract teaches the painter to pull off, with writing implement and ruler, exactly what his camera obscura did on its own. Right angles become oblique, equal distances become unequal, and parallel
Kittler | Perspective and the Book 43
? lines become bundles of rays from an infinitely distant vanishing point, until the finished painting translates all three spatial dimensions into a linear-perspectival illusion. In this way the painting-half a millennium before Macintosh and Windows 95-takes on the logical position of a window, within which the world is graphically projected. And because Alberti describes this window-as if to evoke the painter's canvas itself-as a semitransparent veil of interwoven threads of canvas, every detail of the world finds a tiny bit of the grid that belongs to it
alone. Right-angledgrids assign all data or givens to place values, as with Gutenberg. For this reason alone the comparison with today's desktop systems is not far-
fetched: the pixels on our computer monitors are differentiated from television pictures precisely because they are fully addressable as a two-dimensional matrix. Only this is what makes it possible to switch the monitor into a text mode which,
like all typography, depends entirely on place values. In this sense, Alberti's theory of linear perspective did not just convert an art form into text, but also made a visual
space into paper.
All of these contrivances of windows and veils, plans and elevations, only served
to veil the sad fact that Alberti could not calculate his linear-perspectival images. Just as in the camera obscura, technical processes took the place of calculations. And naturally, a mathematics that would change right angles to oblique and whole- numbered ratios into irrational ones should hardly be imposed on painters, according to Alberti's innocent explanation. But precisely this mathematics was being developed at the time Regiomontanus was importing the learning of Arabic trigonometricians to Europe (minus their passion for the camera obscura). Alberti may have become familiar with this mode of mathematics in Rimini when he met Regiomontanus, then traveling in Italy. It is unfortunate that we will never find out what the two artist-engineers spoke about.
But even without the modern trick of solving equations on graph paper, linear perspective transferred the visible objects of this world onto drawing paper. The only question was what visible objects would even benefit from the application of ruler and compass (to use the words of the famous title of a book by Albrecht Diirer). The fractal branchings of trees or forests certainly would not, simply because geometries without right angles are not translatable into a correlated geom- etry of oblique angles. l2 In other words, the visible objects that would begin the modern victory march of linear-perspectival constructions had to be construc- tions themselves. Forwe know that ever since the Egyptian and Babylonian ages, Eurasia has been in love with the right angle.
It was no coincidence, then, that Alberti dedicated his tract on painting to the architect and fortress-builder who had presented the first perspectival painting
44 Grey Room 05
? to an amazed Florentine public in 1420. As the model for this painting, interest- ingly, Filippo Brunelleschi chose a building for whose doors he had submitted
proposals himself: the Baptistery of Florence. Thus linear perspective began as architectural painting, as the projection of a three-dimensional octagon in its cor- related two-dimensional representation. The fact that Brunelleschi's painting, according to his biographer's report, also contained clouds and other fractals, does not contradict this in the least. As a contrast to the Baptistery, Brunelleschi had not painted the sky at all, but rathersimply left the background-which was an actual mirror-empty. Tothe eye of the observer, if he stood at the assigned place in the center of Florence, the wandering clouds and permanent stones, the mirror image and the illusionistic painting, would all melt together in a virtual reality.
In other words, linear perspective as technical construction aimed to repro- duce technical constructions. The content of a medium, if we follow McLuhan strictly, is never nature, but rather always only another medium. Brunelleschi's
perspective represented the technological adaptation of architectures or con- structions, just as Gutenberg's book printing did with handwriting. Therefore it is no wonder that there soon arose a feedback loop between book printing and
perspective. Not only did churches or baptismal chapels go simultaneously into print and images, but even that technological device that had first enabled the
production of linear-perspectival images itself, the camera obscura-which Alberti,
not Brunelleschi, first applied to the perspectival rendering of the visible-found
itself reproduced using linear perspective. As a woodcut or copper etching whose lines were once again named in print with expressive letters (like Euclid's geo- metric constructions), the functional principles of the camera obscura migrated from one autodidact to another. Interested painters and engineers had only to place themselves at the appointed subject position (as did the observers of Brunelleschi's Baptistery) in orderto see fartherand farther,like dwarves on the shoulders of giants. Everything that European modernity has since celebrated as progress is based on this feedback loop between mathematics, book printing, and linear perspective.
We recall that Alberti's pre-Gutenberg book on linear perspective appeared as a handwritten manuscript in 1435 and was first printed in 1540. Interestingly though, Diirer's Manual of Measurement of Lines, Areas and Solids by Means of Compass and Ruler, a direct extrapolation of Alberti, ended with a thanks to "God our Lord"and with the firm resolution to protect the printed book against thiev- ing presses that might copy it. 13Precisely for this reason Diirer could publish his words and images simultaneously, while Alberti had offered only words. The instruction in measurement ends with technical drawings that repeat Diirer'stheory
Kittler | Perspective and the Book 45
? ? of linear-perspectival drawing once more in images. The painter reproduces him- self, his technical devices, and his painterly model. Thus Diirer'sinstruction is no longer a theory, but rather a sequence of instructions that require the reader to graspboth text and image:"Withthree threads,"begins one of these picture captions,
you can put any tangible thing into a painting, drawing it on a tablet as follows. If you are in a large chamber, hammer a large needle with a wide eye into the wall. It will denote the near point of sight. Then thread it with a strong thread, weighted with a piece of lead. Now place a table as far from the nee-
dle as you wish and place a vertical frame on it, parallel to the wall to which the needle is attached, but as high or low as you wish, and on whatever side you wish. This frame should have a door hinged to it which will serve as your tablet for painting. Now nail the two threads to the top and middle of the frame. These should be as long, respectively, as the frame's width and length, and they should be left hanging. Next, prepare a long iron pointer with a needle's eye at its other end, and attach it to the long thread which leads through the needle that is attached to the wall. Hand this pointer to another person, while you attend to the threads which are attached to the frame. Now proceed as follows. Place a lute or another object to your liking as far from the frame as you wish, but so that it will not move while you are using it. Have your assistant then move the pointer from point to point on the lute, and as often as he rests in one place and stretches the long thread, move the two threads attached to the frame crosswise and in straight lines to confine the long thread. Then stick their ends with wax to the frame, and ask your assistant to relax the tension of the long thread. Next close the door of the frame and mark the spot where the threads cross on the tablet. After this, open the door again and continue with another point, moving from point to point until the entire lute has been scanned and its points have been transferred to the tablet. Then connect all the points on the tablet and you will see the result. 14
46
Grey Room 05
? AlbrechtDOrerT. heSecond PerspectiveApparatus. ManDrawinga Lute. From ThePainter'sManual,1525.
I have intentionally quoted Diirer nearly unabridged, so that you can see what book printing and illustrations made of linear perspective in 1525. All the instruc- tions communicated in text and image are easily formulated as: "Do this, as long as X is true, do that, as soon as Y is true; repeat the same, until Z is no longer true, etc. , etc. " What Diirer begins to at once write and draw up as a perspectival con- struction is something that we today are more familiar with than his contempo- raries. Itis the Europeanizedname of a greatArabicmathematician,i. e. an algorithm. In contrast to both mechanisms and theories, algorithms are defined in two ways: unlike mechanisms they do not merely run a course, but rather undergo specific jumps and loops; but they must nevertheless, unlike theories and despite all jumps and loops, come to an end in finite time.
Next close the door of the frame and mark the spot where the threads cross on the tablet. After this, open the door again and continue with another point, moving from point to point until the entire lute has been scanned and its points have been transferred to the tablet. Then connect all the points on the tablet and you will see the result.
Forthe painters and fortress builders of the Renaissance, whether their names were Brunelleschi, Alberti, or Diirer,the linguistic ruling since Kantthat art is not technology and technology not art was hardly valid. Quite the contrary: Diirer's algorithmic linear perspective has as its counterpart only the algorithms that today
are run as computer graphics or computer music. Not coincidentally, following the algorithm yields not quite the musical instrument called a lute, but only a finite number of outline points. Otherwise, for instance, in an attempt to create the out- line itself through an endless number of points, the algorithm would have to end up in an unallowable infinite loop. Thus the painter does exactly what a digital- analog converter does in the input stages of our computer monitors or sound systems nowadays: it changes a discrete amount of points to a constant function.
In Enzensberger's poem about the inventor of the mechanical clock it is said:
Different
words and wheels. But
the same sky.
This power, which in turn is probably the basis of all Europe's power, accrued to the book not because
of its printed words alone, but rather because of a union of media that, with tech-
nical precision, joined these words with printed images.
Media theorists, specifically Marshall McLuhan and, succeeding him, Vilem
Flusser, draw an absolute distinction between writing and the image that ulti-
mately rests on concepts of geometry. They contrast the linearity or one-dimen-
sionality of printed books with the irreducible two-dimensionality of images.
Simplifiedinthismanner,itisadistinctionthatmayholdtrueevenwhen computer
technology can model texts as strings, as it does today. But it suppresses the sim-
ple facts emphasized long ago and, not coincidentally, by a nouveau romancier, Michel Butor: the books used most often-the Bible, once upon a time, and today
more likely the telephone book-are certainly not read in a linear manner. There is a perfectly good reason for this situation. Though the lines of a book have looked linear since Gutenberg, the page of a book has been two-dimensional since
the Scholasticism of the twelfth century at the latest. 1Each paragraphand section, footnote and title plays across a surface whose two-dimensionality is no different from that of an image. The fact alone that Gutenberg, before using his technology of movable type in Mainz on Bibles and calendars, had practiced the same technol- ogy in Strasbourg for reproducible pictures of the saints indicates that this picto- riality is at the origin of the printing press, which itself is not much more than a sobered-up Rhine wine press. The other issue, continually underscored by Michael Giesecke, that Gutenberg's movable type was never intended for mass production
Grey Room 05, Fall 2001, pp. 38-53. ? 2001 Grey Room, Inc. and Massachusetts Institute of Technology 39
? as such, but rather was supposed to compete with the calligraphic elegance of
manuscript pages, also proves pictoriality as the goal of the printing press. 2
And yet the geometry of the Mainz letters differed from that of the Strasbourg
pictures of the saints. Unlike faces, "letters"-to speak with Sigmund Freud-"do
not occur in nature. "3Gutenberg's press required a geometry of surface, if only because everything depended on putting each individual letter in its place. Each lead letter was practically defined or situated by its right, left, top, and bottom neighbors. In this way each letter filled a gap that was already waiting for it. Letterpress, in its standardization of writing, just continued what the imported Indo-Arabic system of place values did to standardize numerals in the high mid- dle ages. Just as zero, a numeral completely unknown to the Greeks and Romans, put all the other numerals in their proper places, so did the naked spatium, poured into lead by Gutenberg and into verse by Mallarme, proceed with all the other letters. 4 Only with the possibility of replacing the spatium with any arbitrarylet- ter did the internal process known as "the ability to write" get transferred to the external process known as the "typesetter'scase. "Writingin the age of its technical reproducibility is a combinatorial system of standardized elements or characters, just as it was already a combinatorial system of discreet elements or letters since the early Greek vowel alphabet.
The Greeks' stocheia, or letters, were not just the source of the four elements of the ancient world and the one hundred-twenty elements of the atomic present. Elements was also the title of a book that, for two thousand years, provided Greeks, Arabs, and Europeans instruction in the axioms of geometry. The current scholarly enthusiasm for rediscovering images, bodies, and natures forgets all too readily that the elements exist only in groups, which is to say, in code systems. For this reason even Euclid's Elements turned out to be a different book when it first entered the galaxy of Gutenbergin 1482. None other than Regiomontanus, who had imported the new Arabic trigonometry to Europe and, even more relevantly, to Nuremberg, lent his scholarly support to subjecting Euclid's rediscovered geom- etry manuscript to the printing press. While Euclid had used but words to define phenomena such as the point, line, and plane, each axiom was, as of 1482, accom- panied by a print-technological definition: the point appears as a point, the line as a line, etc. , until even-or rather, precisely-mathematics became a "typograph-
ical" event (to use Sybille Kramer'sterm). 5 And if the endpoints of a line printed in this manner are further marked with letters, then the geometric figure has been assigned a name that makes it addressable in all its parts. All this seems self-evident for mathematical or technical drawings, but it shouldn't be in the least. "How greatly this page here resembles a thousand other pages, and how hard it is to be
40 Grey Room 05
Typecase showing the divided compartments for each character.
? flabbergasted at that! ": thus Hans Magnus Enzensberger begins a poem about Johann Gensfieisch zum Gutenberg. 6The same holds true for Regiomontanus, his printer,Ratolf,and scientific visualization in general. Whatstill mattersin European
history today, in its transition to computer-aided posthistory, are neither mass movements nor the gods of war,but ratherthe small-scale, unassuming play of signi- fiers, which nonetheless has shaken (in Lacan'swords) the "moorings of our Being. "
The first among Gutenberg's contemporaries to grasp mathematization, as it developed in the founding years of the printing press, was Leon Battista Alberti, the Florentine noble, architect, master fortress builder, painter, and mathemati- cian. 7 One fine day in 1462 or 1463 he went strolling, as he relates, in the Vatican gardens with a man named Dato. Dato was, by profession, as his evocative name
suggests, personal scribe to the Pope. As we know, all modern diplomacy had its origins in the private offices of secretaries or, rather, secret scribes of the Roman Curia and the Venetian Signoria. Alberti, though, was interested in the exact opposite of traditional cryptography. He remarked off-handedly, as the two were perambulating under Roman palms, that the man in Mainz was just now probably making ten copies of an ancient manuscript and thus saving it. That must have prompted the Papal cryptographerto reply that his tedious labor of replacing letter after letter with yet other letters would, alas, not be so easy to mechanize as print- ing presses or the printer's case. Whereupon Alberti took up his quill and com- posed a tract that to this day is the watershed of modern cryptography.
Ancient cryptography, developed by Julius Caesar and adopted by Augustus, was a simplistic game with the Latin alphabet. Both Caesars worked by displac- ing each letter one or more places, until, for example, A was B, B was C, and C was D-in the course of which it never occurred to the great Augustus that his let- ter game was a kind of modulus mathematics: X, the last letter of his alphabet, did not turn into A again, but rather an exceptional AA. 8 Alberti found codes of this simplicity, still prevalent in his day, to be but child's play. He merely counted the frequency of each letter in uncoded Latin or Italian texts and then compared them with the frequency of letters in the cryptogram. In other words: Alberti translated the principle of Gutenberg'sprinter's cases, which had to provide more lead char- acters for the frequently occurring letters than the rarer ones and so are always-
already letter frequency analyzers, straight into cryptoanalysis.
He then applied this principle to cryptography,or encoding. Tooutdo the simple code bearing Caesar'sname, Alberti constructed two concentric rings, each inscribed with differently scrambled alphabets, so that a turn of the outer ring changed the correspondence between the two alphabets. Consequently, the privy scribe had
only to read the current correspondence and write it down, then turn the outer ring Kittler I Perspective and the Book 41
? another space. The tedious labor of Dato and his peers became, once again strictly as a consequence of Gutenberg, literally a mechanics of movable characters. Thus Leon Battista Alberti pursued his conversation in Rome to its logical conclusion:
with letter frequency analysis for decoding and a polyalphabetic key for encoding, he bestowed upon modern Europe the principle-or better, power-of its strate- gic secrets.
Even "The Life of the Florentine Architect Leone Battista Alberti," as Giorgio
Vasari titled his 1570 biography of Alberti, already suggested a parallel between
Gutenberg and Alberti-though, surprisingly enough, not between the printing
press and cryptography but between the printing press and linear perspective. Vasari states:
In the year 1457, when the very useful method of printing books was discov- ered by JohannGutenbergthe German,Leon Batista [sic], working on similar
lines, discovered a way of tracing natural perspectives and of effecting the diminution of figures by means of an instrument, and likewise the method
of enlarging small things and reproducing them on a greater scale; all inge- nious inventions, useful to art and very beautiful. 9
Precisely because he dated Gutenberg'saccomplishment ten years too late, Vasari's mission seems to pander to an early-modern brand of local patriotism: an "art"
that Germany had bestowed upon modernity is supposed to have been matched by Italy with a "similar" "art"in the same year. Now, what Vasari's ill-informed Alberti biography meant by that instrument, which sounds like Scheiner's panto- graph of two centuries later, remains an occluded mystery for the history of tech- nology. The scholarship assumes (on the basis of a second, anonymous Alberti biographer) that the alleged instrument for the magnification and reduction of images was in reality a camera obscura. "Alberti,"writes this biographer,
produced quite unbelievable things through paintings, which he had one look at through a narrow opening into a small box. There one saw the highest
mountains and faraway landscapes around the vast ocean, and regions so far
away from the eye, so distant, that one's power of vision was unable to dis-
tinguish them. He called these things demonstrations, and they were of a kind
such that persons whether experienced and inexperienced would think they were seeing not paintings, but the natural phenomena themselves. 10
Should the anonymous biographerdeserve more credit than Vasari,then Alberti's
demonstrations did exactly what this apocryphal pantograph did: they magnified distant objects and reduced close ones, entirely at the whim of a projection tech-
42 Grey Room 05
? nology that sent natural phenomena through the narrow aperture of a camera obscura. Alberti had thus replaced a craft, which painting was to remain at least until the invention of photography, with an optical media technology. The camera obscura-because it, even as a construction consisting of just an aperture and
projection wall, implements the linear-perspectival geometry of our seeing- created reproductions of the world exactly as free of copying errors as otherwise only Gutenberg's printed books were. This-it seems to me, at least-is the whole point of Vasari's German-Italian heroic saga.
The first edition of the Regensburg Missal of 1485 was praised by the clerics in
charge of its production as a "miracle of God. "The clerics had in fact, according
to Michael Giesecke, compared all the individual copies of the missal with its set-
ting copy, only to come to the conclusion that "in the letters, syllables, words,
sentences, periods, paragraphs and all attendant matters, the printing of all the
copies agrees, in every respect, with the setting copy. . . provided by our cathedral.
Forthis we must thank God. "11The "inexperienced" and "experienced"persons for whom Alberti's camera obscura projected the natural phenomena themselves in
place of paintings could not have been more amazed and delighted. Two simulta- neous technologies had appeared, poised to eliminate the disturbance of the human hand from texts and from images. In the same historical moment, books, and paint- ings entered the age of their technical, and thus noiseless, reproducibility.
It is no wonder, then, that both technologies of reproduction should melt into
a single one. The single geometry, as presented in the newborn printed edition of Euclid, became equally an element of text and image. None other than Alberti was
responsible for embarking upon this integration. In 1435, not quite ten years before Gutenberg's first Bible printing, Alberti's tract "On Painting," which would not
appear in print until 1540, appeared as a hand-written manuscript. This text not only transferreda form of knowledge, one that for centuries had been handed down through workshop conversations between masters and apprentices, to an autodi- dactic theory; it was also the first time the mute technology of linear perspective, or the camera obscura, was put to paper.
The first of Alberti's three "Books on Painting" appeared at the exact point where, later, the 1482 Euclid edition would begin: with the geometric definitions ofpoint,line,andplane. Itmisuses Greekmathematics,though,forapurposequite
unknown to antiquity: for the construction of linear-perspectival pictures. The three elements are only defined in order to convey a fourth, that is, the space of natural phenomena and buildings. Alberti's tract teaches the painter to pull off, with writing implement and ruler, exactly what his camera obscura did on its own. Right angles become oblique, equal distances become unequal, and parallel
Kittler | Perspective and the Book 43
? lines become bundles of rays from an infinitely distant vanishing point, until the finished painting translates all three spatial dimensions into a linear-perspectival illusion. In this way the painting-half a millennium before Macintosh and Windows 95-takes on the logical position of a window, within which the world is graphically projected. And because Alberti describes this window-as if to evoke the painter's canvas itself-as a semitransparent veil of interwoven threads of canvas, every detail of the world finds a tiny bit of the grid that belongs to it
alone. Right-angledgrids assign all data or givens to place values, as with Gutenberg. For this reason alone the comparison with today's desktop systems is not far-
fetched: the pixels on our computer monitors are differentiated from television pictures precisely because they are fully addressable as a two-dimensional matrix. Only this is what makes it possible to switch the monitor into a text mode which,
like all typography, depends entirely on place values. In this sense, Alberti's theory of linear perspective did not just convert an art form into text, but also made a visual
space into paper.
All of these contrivances of windows and veils, plans and elevations, only served
to veil the sad fact that Alberti could not calculate his linear-perspectival images. Just as in the camera obscura, technical processes took the place of calculations. And naturally, a mathematics that would change right angles to oblique and whole- numbered ratios into irrational ones should hardly be imposed on painters, according to Alberti's innocent explanation. But precisely this mathematics was being developed at the time Regiomontanus was importing the learning of Arabic trigonometricians to Europe (minus their passion for the camera obscura). Alberti may have become familiar with this mode of mathematics in Rimini when he met Regiomontanus, then traveling in Italy. It is unfortunate that we will never find out what the two artist-engineers spoke about.
But even without the modern trick of solving equations on graph paper, linear perspective transferred the visible objects of this world onto drawing paper. The only question was what visible objects would even benefit from the application of ruler and compass (to use the words of the famous title of a book by Albrecht Diirer). The fractal branchings of trees or forests certainly would not, simply because geometries without right angles are not translatable into a correlated geom- etry of oblique angles. l2 In other words, the visible objects that would begin the modern victory march of linear-perspectival constructions had to be construc- tions themselves. Forwe know that ever since the Egyptian and Babylonian ages, Eurasia has been in love with the right angle.
It was no coincidence, then, that Alberti dedicated his tract on painting to the architect and fortress-builder who had presented the first perspectival painting
44 Grey Room 05
? to an amazed Florentine public in 1420. As the model for this painting, interest- ingly, Filippo Brunelleschi chose a building for whose doors he had submitted
proposals himself: the Baptistery of Florence. Thus linear perspective began as architectural painting, as the projection of a three-dimensional octagon in its cor- related two-dimensional representation. The fact that Brunelleschi's painting, according to his biographer's report, also contained clouds and other fractals, does not contradict this in the least. As a contrast to the Baptistery, Brunelleschi had not painted the sky at all, but rathersimply left the background-which was an actual mirror-empty. Tothe eye of the observer, if he stood at the assigned place in the center of Florence, the wandering clouds and permanent stones, the mirror image and the illusionistic painting, would all melt together in a virtual reality.
In other words, linear perspective as technical construction aimed to repro- duce technical constructions. The content of a medium, if we follow McLuhan strictly, is never nature, but rather always only another medium. Brunelleschi's
perspective represented the technological adaptation of architectures or con- structions, just as Gutenberg's book printing did with handwriting. Therefore it is no wonder that there soon arose a feedback loop between book printing and
perspective. Not only did churches or baptismal chapels go simultaneously into print and images, but even that technological device that had first enabled the
production of linear-perspectival images itself, the camera obscura-which Alberti,
not Brunelleschi, first applied to the perspectival rendering of the visible-found
itself reproduced using linear perspective. As a woodcut or copper etching whose lines were once again named in print with expressive letters (like Euclid's geo- metric constructions), the functional principles of the camera obscura migrated from one autodidact to another. Interested painters and engineers had only to place themselves at the appointed subject position (as did the observers of Brunelleschi's Baptistery) in orderto see fartherand farther,like dwarves on the shoulders of giants. Everything that European modernity has since celebrated as progress is based on this feedback loop between mathematics, book printing, and linear perspective.
We recall that Alberti's pre-Gutenberg book on linear perspective appeared as a handwritten manuscript in 1435 and was first printed in 1540. Interestingly though, Diirer's Manual of Measurement of Lines, Areas and Solids by Means of Compass and Ruler, a direct extrapolation of Alberti, ended with a thanks to "God our Lord"and with the firm resolution to protect the printed book against thiev- ing presses that might copy it. 13Precisely for this reason Diirer could publish his words and images simultaneously, while Alberti had offered only words. The instruction in measurement ends with technical drawings that repeat Diirer'stheory
Kittler | Perspective and the Book 45
? ? of linear-perspectival drawing once more in images. The painter reproduces him- self, his technical devices, and his painterly model. Thus Diirer'sinstruction is no longer a theory, but rather a sequence of instructions that require the reader to graspboth text and image:"Withthree threads,"begins one of these picture captions,
you can put any tangible thing into a painting, drawing it on a tablet as follows. If you are in a large chamber, hammer a large needle with a wide eye into the wall. It will denote the near point of sight. Then thread it with a strong thread, weighted with a piece of lead. Now place a table as far from the nee-
dle as you wish and place a vertical frame on it, parallel to the wall to which the needle is attached, but as high or low as you wish, and on whatever side you wish. This frame should have a door hinged to it which will serve as your tablet for painting. Now nail the two threads to the top and middle of the frame. These should be as long, respectively, as the frame's width and length, and they should be left hanging. Next, prepare a long iron pointer with a needle's eye at its other end, and attach it to the long thread which leads through the needle that is attached to the wall. Hand this pointer to another person, while you attend to the threads which are attached to the frame. Now proceed as follows. Place a lute or another object to your liking as far from the frame as you wish, but so that it will not move while you are using it. Have your assistant then move the pointer from point to point on the lute, and as often as he rests in one place and stretches the long thread, move the two threads attached to the frame crosswise and in straight lines to confine the long thread. Then stick their ends with wax to the frame, and ask your assistant to relax the tension of the long thread. Next close the door of the frame and mark the spot where the threads cross on the tablet. After this, open the door again and continue with another point, moving from point to point until the entire lute has been scanned and its points have been transferred to the tablet. Then connect all the points on the tablet and you will see the result. 14
46
Grey Room 05
? AlbrechtDOrerT. heSecond PerspectiveApparatus. ManDrawinga Lute. From ThePainter'sManual,1525.
I have intentionally quoted Diirer nearly unabridged, so that you can see what book printing and illustrations made of linear perspective in 1525. All the instruc- tions communicated in text and image are easily formulated as: "Do this, as long as X is true, do that, as soon as Y is true; repeat the same, until Z is no longer true, etc. , etc. " What Diirer begins to at once write and draw up as a perspectival con- struction is something that we today are more familiar with than his contempo- raries. Itis the Europeanizedname of a greatArabicmathematician,i. e. an algorithm. In contrast to both mechanisms and theories, algorithms are defined in two ways: unlike mechanisms they do not merely run a course, but rather undergo specific jumps and loops; but they must nevertheless, unlike theories and despite all jumps and loops, come to an end in finite time.
Next close the door of the frame and mark the spot where the threads cross on the tablet. After this, open the door again and continue with another point, moving from point to point until the entire lute has been scanned and its points have been transferred to the tablet. Then connect all the points on the tablet and you will see the result.
Forthe painters and fortress builders of the Renaissance, whether their names were Brunelleschi, Alberti, or Diirer,the linguistic ruling since Kantthat art is not technology and technology not art was hardly valid. Quite the contrary: Diirer's algorithmic linear perspective has as its counterpart only the algorithms that today
are run as computer graphics or computer music. Not coincidentally, following the algorithm yields not quite the musical instrument called a lute, but only a finite number of outline points. Otherwise, for instance, in an attempt to create the out- line itself through an endless number of points, the algorithm would have to end up in an unallowable infinite loop. Thus the painter does exactly what a digital- analog converter does in the input stages of our computer monitors or sound systems nowadays: it changes a discrete amount of points to a constant function.
In Enzensberger's poem about the inventor of the mechanical clock it is said:
Different
words and wheels. But
the same sky.
That's the Dark Age we still
live in today. 15
We still live in these middle ages not because movable type and linear-perspec- tival images necessarily follow from the laws of technology or even from the nature of things. We live in the space of these inventions only because they were
Kittler J Perspective and the Book 47
? ? Right:Agostino Ramelli. Engraving from Diverse et Artificiose Machine, 1588.
Opposite: Anonymous. Woodcut from Johann Schreck
and Philip Wang Zheng, Yuan-xiQiqi Tu-shuo, 1627.
contingent. They are a European legacy, upon which all Europe's power was based. Even
the fact that book printing and linear per-
spective are today as unremarkable as they St
arewidespread is a consequence of this power. The artillery ships, Bible societies, and machine guns of the nineteenth century have finally managed to recast the world in mov- able type and perspectival vanishing points.
This was not always the case. 16 Around
1620, immediately after the founding of their
papal propaganda ministry, the Jesuits decided to give all nations and empires the
gift of the new union between the media of printing and technical perspectival
drawing. Consequently, a Gutenberg-like printing press was founded in Peking, the center of the empire of the center. As if paper had found its way home after
its long travels from China via Arabia and Sicily to Mainz, the Jesuits set to work
on converting the "simple" Chinese with simply illustrated Bibles. However, this
technology apparently seemed too weak for the son of heaven himself. For the
conversion of the Emperor, only one technology was considered for the presen-
tation of Europe's higher technology. Thus, Father Johannes Adam Schall von
Bell, successor to Matteo Ricci, imported a purely scientific library from Rome to
Peking, containing nineteen titles on linear perspective alone. With this, every-
thing seemed ready for bestowing China with the favor not only of reproducible
texts but also of equally reproducible technical drawings. But, perhaps due to blindness and/or hubris, the mission officials-not in Peking, but in faraway
Rome-made a remarkable mistake: as natives to be instructed in copper etching and perspectival drawing they chose not Chinese but rather Japanese from the Christian enclave that in 1945 would become world-famous as Nagasaki. 17In
Nagasaki, though-you guessed it-there were absolutely no tracts by, say, Alberti or Diirer.
And so the inevitable happened. Father Schall von Bell, in order to confront
the Emperor of China with superior European technology, decided to put four ambitious volumes "with diagrams and explanations of curious machines from the
FarWest"through Peking's printing presses. 18The so-called TheatraMachinarum, a book genre not coincidentally flourishing since the Renaissance, generally con- tained exact perspectival copper etchings or woodcuts of existing or else only fictive machines-drawings, that is, that were supposed to make it possible for
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