Sacred Texts Age of Reason Index
III. Six Books on Light and Shade Index
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The shaded and illuminated sides of opaque objects will display the same proportion of light and darkness as their objects 68 .
89:68 6: The meaning of obbietti (objects) is explained in no 153, lines 1-4.--Between the title-line and the next there is, in the original, a small diagram representing a circle described round a square.