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object, set up by a perpendicular line as shown at r s--then, I
say, that if you were to look at the side of the square that is
nearest to you it will appear at the bottom of the vertical plane r
s, and then look at the farther side and it would appear to you at
the height of the point n on the vertical plane. Thus, by this
example, you can understand that if the eye is above a number of
objects all placed on the same level, one beyond another, the more
remote they are the higher they will seem, up to the level of the
eye, but no higher; because objects placed upon the level on which
your feet stand, so long as it is flat--even if it be extended into
infinity--would never be seen above the eye; since the eye has in
itself the point towards which all the cones tend and converge which
convey the images of the objects to the eye. And this point always
coincides with the point of diminution which is the extreme of all
we can see. And from the base line of the first pyramid as far as
the diminishing point
[Footnote: The two diagrams above the chapter are explained by the
first five lines. They have, however, more letters than are referred
to in the text, a circumstance we frequently find occasion to
remark.]
5
6.
there are only bases without pyramids which constantly diminish up
to this point. And from the first base where the vertical plane is
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