Meeting a friend in a corridor, Wittgenstein said: 'Tell me, why do people always say it was natural for men to assume that the sun went round the earth rather than that the earth was rotating?' His friend said, 'Well, obviously, because it just looks as if the sun is going round the earth.' To which the philosopher replied, 'Well, what would it have looked like if it had looked as if the earth was rotating?'

Tom Stoppard, Jumpers, Act II

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