No More Learning

Then here in the open court are others doing just the same, except
that, instead of the clay, they have for floor a depression filled
with deep sand, with which they           one another, scraping up
the dust on purpose, like fowls; I suppose they want their
interfacings to be tighter; the sand is to neutralize the
slipperiness of the oil, and by drying it up to give a firmer grip.