postures of the mind with which the written form could not 
cope, any more than it could command mime and gesture. 
Moreover, that the photograph is quite versatile in revealing 
and arresting posture and structure wherever it is used, occurs 
in countless examples, such as the analysis of bird-flight. It was 
the photograph that revealed the secret of bird-flight and 
enabled man to take off. The photo, in arresting bird-flight, 
showed that it was based on a principle of wing fixity . Wing 
movement was seen to be for propulsion, not for flight.

     Perhaps the great revolution produced by photograph 
was in the traditional arts. The painter could no longer depict a 
world that had been much photographed. He turned, instead, 
to reveal the inner process of creativity in expressionism and in 
abstract art. Likewise, the novelist could no longer describe 
objects or happenings for readers who already knew what was