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Ideas for 'Knowledge', 'fragments/reports' and 'The Lagoon: how Aristotle invented science'

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6. Mathematics / A. Nature of Mathematics / 2. Geometry

1553	No perceptible object is truly straight or curved [Protagoras]
	Full Idea: No perceptible object is geometrically straight or curved; after all, a circle does not touch a ruler at a point, as Protagoras used to say, in arguing against the geometers.
	From: Protagoras (fragments/reports [c.441 BCE], B07), quoted by Aristotle - Metaphysics 998a1