It was Empedocles who said that light, being a body, is an effluent substance emitted from the luminous body ... but that this movement of light is such that we fail to notice it because of its speed.
Cited by H. Diels in Die Fragmente der Vorsokratiker 6th edition Berlin 1951, 31 A 57 and cited by S. Sambursky in Physical Thought from the Presocratics to the Quantum Physicists (Hutchinson, London, 1974) p. 52.
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