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4
29.
Never paint leaves transparent to the sun, because they are
confused; and this is because on the transparency of one leaf will
be seen the shadow of another leaf which is above it. This shadow
has a distinct outline and a certain depth of shade and sometimes is
[as much as] half or a third of the leaf which is shaded; and
consequently such an arrangement is very confused and the imitation
of it should be avoided.
The light shines least through a leaf when it falls upon it at an
acute angle.
The gradations of shade and colour in leaves (430-434).
4
30.
The shadows of plants are never black, for where the atmosphere
penetrates there can never be utter darkness.
4
31.
If the light comes from m and the eye is at n the eye will see
the colour of the leaves a b all affected by the colour of m
-
-that is of the atmosphere; and b c will be seen from the under
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