116. Farther, what greatly contributes to make us mistake in this matter
is that when we think of the pictures in the fund of the eye, we imagine
ourselves looking on the fund of another's eye, or another looking on the
fund of our own eye, and beholding the pictures painted thereon. Suppose
two eyes A and B: A from some distance looking on the pictures in B sees
them inverted, and for that reason concludes they are inverted in B: but
this is wrong. There are projected in little on the bottom of A the
images of the pictures of, suppose, man, earth, etc., which are painted
on B. And besides these the eye B itself, and the objects which environ
it, together with another earth, are projected in a larger size on A.
Now, by the eye A these larger images are deemed the true objects, and
the lesser only pictures in miniature. And it is with respect to those
greater images that it determines the situation of the smaller images: so
that comparing the little man with the great earth, A judges him
inverted, or that the feet are farthest from and the head nearest to the
great earth. Whereas, if A compare the little man with the little earth,
then he will appear erect, i.e. his head shall seem farthest from, and
his feet nearest to, the little earth. But we must consider that B does
not see two earths as A does: it sees only what is represented by the
little pictures in A, and consequently shall judge the man erect.
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