brain runs through its rules one after another, matching 
     the input with its various models until somehow unison is 
     achieved. This may perhaps only be after strenuous, 
     varied, and prolonged searching. During this random 
     activity further connections and action patterns are 
     formed and they in turn will determine future sequences.

     The inevitable drive for “closure,” “completion,” or 
equilibrium occurs both with the suppression and the extension 
of human sense or function. Since The Gutenberg Galaxy  is a 
series of historical observations of the new cultural completions 
ensuing upon the “disturbances,” first of literacy, and then of 
printing, the statement of an anthropologist may assist the 
reader at this point:

          Today man has developed extensions for practically