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[
Footnote: The two lower sketches on the left of Pl XXVIII, No. 3,
refer to lines 21-23. The upper sketch has apparently been effaced
by Leonardo himself.]
The distribution of light and shade with reference to the position
of the spectator (441-443).
4
41.
The shadows of trees placed in a landscape do not display themselves
in the same position in the trees on the right hand and those on the
left; still more so if the sun is to the right or left. As is proved
by the 4th which says: Opaque bodies placed between the light and
the eye display themselves entirely in shadow; and by the 5th: The
eye when placed between the opaque body and the light sees the
opaque body entirely illuminated. And by the 6th: When the eye and
the opaque body are placed between darkness and light, it will be
seen half in shadow and half in light.
[
Footnote: See the figure on the right hand side of Pl. XXVIII, No.
. The first five lines of the text are written below the diagram
and above it are the last eight lines of the text, given as No.
3
4
61.]
4
42.
313
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