| 55 | 56 | 57 | 58 | 59 |
| 1 | 306 | 613 | 919 | 1225 |
|
than the said [black] spot would never be seen as a whole; as may be
seen in the diagram below. Let a. be the seat of sight, b e the
lines which reach the eye. Let e d be the grains of millet within
these lines. You plainly see that these will never diminish by
distance, and that the body m n could not be entirely covered by
it. Therefore you must confess that the eye contains within itself
one single indivisible point a, to which all the points converge
of the pyramid of lines starting from an object, as is shown below.
Let a. b. be the eye; in the centre of it is the point above
mentioned. If the line e f is to enter as an image into so small
an opening in the eye, you must confess that the smaller object
cannot enter into what is smaller than itself unless it is
diminished, and by diminishing it must take the form of a pyramid.
5
3.
PERSPECTIVE.
Perspective comes in where judgment fails [as to the distance] in
objects which diminish. The eye can never be a true judge for
determining with exactitude how near one object is to another which
is equal to it [in size], if the top of that other is on the level
of the eye which sees them on that side, excepting by means of the
vertical plane which is the standard and guide of perspective. Let
n be the eye, e f the vertical plane above mentioned. Let a b c
d be the three divisions, one below the other; if the lines a n
5
7
Page
Quick Jump
|