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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Timaeus by Plato: the eye meets the light of the sun, and both together meet the light
issuing from an external object, this is the simple act of sight. When the
particles of light which proceed from the object are exactly equal to the
particles of the visual ray which meet them from within, then the body is
transparent. If they are larger and contract the visual ray, a black
colour is produced; if they are smaller and dilate it, a white. Other
phenomena are produced by the variety and motion of light. A sudden flash
of fire at once elicits light and moisture from the eye, and causes a
bright colour. A more subdued light, on mingling with the moisture of the
eye, produces a red colour. Out of these elements all other colours are
derived. All of them are combinations of bright and red with white and
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