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III. Six Books on Light and Shade Index
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158.

p. 91

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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