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General remarks on perspective (40-41).
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0.
ON PAINTING.
Perspective is the best guide to the art of Painting.
[
Footnote: 40. Compare 53, 2.]
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1.
The art of perspective is of such a nature as to make what is flat
appear in relief and what is in relief flat.
The elements of perspective--Of the Point (42-46).
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2.
All the problems of perspective are made clear by the five terms of
mathematicians, which are:--the point, the line, the angle, the
superficies and the solid. The point is unique of its kind. And the
point has neither height, breadth, length, nor depth, whence it is
to be regarded as indivisible and as having no dimensions in space.
The line is of three kinds, straight, curved and sinuous and it has
neither breadth, height, nor depth. Hence it is indivisible,
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