Ideas from 'Against Theophrastus (frags)' by Epicurus [290 BCE], by Theme Structure

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12. Knowledge Sources / B. Perception / 2. Qualities in Perception / d. Secondary qualities
Epicurus says colours are relative to the eye, not intrinsic to bodies [Plutarch]
13. Knowledge Criteria / E. Relativism / 1. Relativism
When entering a dark room it is colourless, but colour gradually appears