Don't say: “They must have something in common, or they would not be called ‘games’" but look and see whether there is anything common to all. For if… - Ludwig Wittgenstein

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Don't say: “They must have something in common, or they would not be called ‘games’" but look and see whether there is anything common to all. For if you look at them, you won't see something that is common to all, but similarities, affinities, and a whole series of them at that. To repeat: don't think, but look!