Volume Volume1\Light and Shade\Book3
Entry# 158. Definition of derived shadow (158. 159).
Contents: Vol. 1 | Vol. 2
THIRD BOOK ON LIGHT AND SHADE.
Definition of derived shadow (158. 159).
Derived shadow cannot exist without primary shadow. This is proved
by the first of this which says: Darkness is the total absence of
light, and shadow is an alleviation of darkness and of light, and it
is more or less dark or light in proportion as the darkness is
modified by the light.
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