Pictorial Introduction to 'Graphics for The Blind'

Diagrams 1: Simplify

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Reduce to basics, do not copy irrelevant embellishments.

Braille picture ¼ size
Light A, 2 meters from screen; ball with center B, radius 30cm; line AB perpendicular to screen, AB=1m.
We don't want our readers to waste time puzzling over the professor's head.

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