culture and perception that make first, writing, and then, 
perhaps, alphabet possible at all. (9)

     Wilson’s account of the years of perceptual training 
needed to enable adult Africans to be able to see movies has 
its exact analogue in the difficulties which Western adults have 
with “abstract” art. In 1925 Bertrand Russell wrote his ABC of  
Relativity , pointing out on the first page that:

     Many of the new ideas can be expressed in non-
     mathematical language, but they are none the less 
     difficult on that account. What is demanded is a change 
     in our imaginative picture of the world. . . . The same sort 
     of change was demanded by Copernicus, when he taught 
     that the earth is not stationary. . . . To us now there is no 
     difficulty in this idea, because we learned it before our