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The Problems of Philosophy - Russell, Bertrand ยท 70 words
It is sometimes said that light is a form of wave motion, but this is misleading, for the light which we immediately see, which we know directly by means of our senses, is not a form of wave motion, but something quite different something which we all know if we are not blind, though we cannot describe it so as to convey our knowledge to a man who is blind.
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