Volume Volume1\Light and Shade\Book3
Entry# 163. On the relation of derived and primary shadow (163-165).
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On the relation of derived and primary shadow (163-165).
The derived shadow can never resemble the body from which it
proceeds unless the light is of the same form and size as the body
causing the shadow.
The derived shadow cannot be of the same form as the primary shadow
unless it is intercepted by a plane parallel to it.
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