III. Six Books on Light and Shade: 165.
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III. Six Books on Light and Shade: 165.
165.
Any shadow cast by a body in light and shade is of the same nature and character as that which is inseparable from the body. The centre of the length of a shadow always corresponds to that of the luminous body 72 . It is inevitable that every shadow must have its centre in a line with the centre of the light.
On the shape of derived shadows (166-174).
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