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and c n are of a given length and the eye n is in the centre,
then a b will look as large as b c. c d is lower and farther off
from n, therefore it will look smaller. And the same effect will
appear in the three divisions of a face when the eye of the painter
who is drawing it is on a level with the eye of the person he is
painting.
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4.
TO PROVE HOW OBJECTS REACH THE EYE.
If you look at the sun or some other luminous body and then shut
your eyes you will see it again inside your eye for a long time.
This is evidence that images enter into the eye.
The relations of the distance points to the vanishing point (55-56).
5
5.
ELEMENTS OF PERSPECTIVE.
All objects transmit their image to the eye in pyramids, and the
nearer to the eye these pyramids are intersected the smaller will
the image appear of the objects which cause them. Therefore, you may
intersect the pyramid with a vertical plane [Footnote 4: Pariete.
Compare the definitions in 85, 2-5, 6-27. These lines refer
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