HoP 132 - Eye of the Beholder - Theories of Vision
History of Philosophy Without Any Gaps
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The Problem With the Visual Ray Theory
Air is transparent because it does not block our vision. When something intercepts the visual ray, then we see it instead of seeing through it. For this reason, Alcinde tells us, it is the element Earth that gives rise to visibility in objects. Even dense objects are seen only when their surfaces are illuminated.
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