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III. Six Books on Light and Shade Index
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Let a be the light, b the eye, c the object seen by the eye and in the light. These show, first, the eye between

p. 72

the light and the body; the 2nd, the light between the eye and the body; the 3rd the body between the eye and the light, a is the eye, b the illuminated object, c the light.

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