tendency the effect of typography on the arts and sciences as 
well as upon human sensibility. Thus the habit of a fixed 
position or “point of view” so natural to the reader of 
typography, gave popular extension to the avant-garde 
perspectivism of the fifteenth century:

          Perspective rapidly became an essential part of the 
     technique of making informative pictures, and before long 
     was demanded of pictures that were not informative. Its 
     introduction had much to do with that western European 
     preoccupation with verisimilitude, which is probably the 
     distinguishing mark of subsequent European picture 
     making. The third of these events was Nicholas of Cusa’s 
     enunciation, in 1440, of the first thorough-going 
     doctrines of the relativity of knowledge and of the 
     continuity, through transitions and middle terms,