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ON PAINTING.
The derived shadow is stronger in proportion as it is nearer to its
place of origin.
1
76.
HOW SHADOWS FADE AWAY AT LONG DISTANCES.
Shadows fade and are lost at long distances because the larger
quantity of illuminated air which lies between the eye and the
object seen tints the shadow with its own colour.
1
77.
a b will be darker than c d in proportion as c d is broader
than a b.
[Footnote: In the original MS. the word lume (light) is written at
the apex of the pyramid.]
1
78.
It can be proved why the shadow o p c h is darker in proportion as
it is nearer to the line p h and is lighter in proportion as it is
nearer to the line o c. Let the light a b, be a window, and let
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