Sacred Texts Age of Reason Index
III. Six Books on Light and Shade Index
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The eye which looks (at a spot) half way between the shadow and the light which
surrounds the body in shadow will see that the deepest shadows on that body will meet
the eye at equal angles, that is at the same angle as that of sight.
85:65 : In both these diagrams A stands for lume (light) B for ombra (shadow).
