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look like a perfect picture. If you look with the eye a, b at
the spot c, this point c will appear to be at d, f, and if
you look at it with the eye g, h will appear to be at m. A
picture can never contain in itself both aspects.
2
9.
Let the object in relief t be seen by both eyes; if you will look
at the object with the right eye m, keeping the left eye n shut,
the object will appear, or fill up the space, at a; and if you
shut the right eye and open the left, the object (will occupy the)
space b; and if you open both eyes, the object will no longer
appear at a or b, but at e, r, f. Why will not a picture
seen by both eyes produce the effect of relief, as [real] relief
does when seen by both eyes; and why should a picture seen with one
eye give the same effect of relief as real relief would under the
same conditions of light and shade?
[Footnote: In the sketch, m is the left eye and n the right,
while the text reverses this lettering. We must therefore suppose
that the face in which the eyes m and n are placed is opposite
to the spectator.]
3
0.
The comparative size of the image depends on the amount of light
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