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'Protagoras', 'Political Philosophy (3rd ed)' and 'Vagueness and Contradiction'
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12. Knowledge Sources / B. Perception / 2. Qualities in Perception / d. Secondary qualities
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The colour bands of the spectrum arise from our biology; they do not exist in the physics [Sorensen]
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12. Knowledge Sources / B. Perception / 5. Interpretation
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We are unable to perceive a nose (on the back of a mask) as concave [Sorensen]
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