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Updated: May 11, 2025
As a child I sat for hours under a dim yellow light, mesmerized by images appearing on paper submerged in trays filled with smelly liquid. Yellow, my father taught me, has no apparent effect on the light-sensitive specks coating photographic paper.
This one showed the usual paper-dry whorls or leaves, and the usual barrel-body, perhaps common to arid country growths, everywhere. Scattered over the barrel, between the spines, were glinting specks vegetable, light-sensitive cells developed into actual visual organs.
Wherever or whenever a beam of light can be received, interrupted, modified, amplified, or controlled in any way, a light-sensitive cell can be employed to generate the impulse, which, properly applied, can do almost anything. "Does that seem too involved?" asked Professor Brierly. "No, I think not. It was acting on that theory that I experimented with well, come along and I will show you."
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