relations of our senses.

     Merely for the purpose of finding our bearings it may be 
helpful to compare and contrast a few instances of literature 
and art in the newly literate Greek world, on one hand, and the 
nonliterate world, on the other.

     It is significant, however, that the Romans did go beyond 
the Greeks in the awareness of visual properties:

     Lucretius is neither speaking of, nor interested in, the 
     problems of representation. His description of the purely 
     optical phenomena does, however, go considerably 
     beyond the cautious observations of Euclid. It is a 
     complete description, not of the expanding visual cone, 
     but of the apparent cone of contraction, or diminution,