between extremes. This was a fundamental challenge to 
     definitions and ideas that had tangled thought since the 
     time of the ancient Greeks.

          These things, the exactly repeatable pictorial 
     statement, a logical grammar for representation of space 
     relationship in pictorial statements, and the concepts of 
     relativity and continuity, were and still are superficially so 
     unrelated that they are rarely thought of seriously in 
     conjunction with one another. But, between them, they 
     have revolutionized both the descriptive sciences and the 
     mathematics on which the science of physics rests, and 
     in addition they are essential to a great deal of modern 
     technology. Their effects on art have been very marked. 
     They were absolutely new things in the world. There was 
     no precedent for them in classical practice or thought of