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08602_Field_TCGG T367.txt
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so ignorant of geometry that Alberti thought it necessary
to explain the words diameter and perpendicular. (33)
It is necessary for the understanding of the visual take-
off that was to occur with Gutenberg technology, to know that
such a take-off had not been possible in the manuscript ages,
for such a culture retains the audile-tactile modes of human
sensibility in a degree incompatible with abstract visuality or
the translation of all the senses into the language of unified,
continuous, pictorial space. That is why Ivins is entirely justified
in maintaining in his Art and Geometry (p. 41):
Perspective is something quite different from
foreshortening. Technically, it is the central projection of
a three-dimensional space upon a plane. Untechnically, it
is the way of making a picture on a flat surface in such a