Ludwig Wittgenstein Quotes
Black seems to make a colour cloudy, but darkness doesn't. A ruby could thus keep getting darker without ever becoming cloudy; but if it became blackish red, it would become cloudy.
Citations
Wittgenstein, Ludwig. Remarks on Colour. Edited by G.E.M. Anscombe, translated by Linda L. McAlister and Margarete Schättle, University of California Press, 1977, p. 11e.
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Ludwig Josef Johann Wittgenstein was an Austrian-British philosopher who worked primarily in logic, the philosophy of mathematics, the philosophy of mind, and the philosophy of language.