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22747 | A man walking backwards on a forwards-moving ship is moving in a fixed place [Sext.Empiricus] |
Full Idea: If a ship moves forward and a man carries a rod backwards on it, then it is possible for an object to move without quitting its place. | |
From: Sextus Empiricus (Against the Physicists (two books) [c.180], II.056) | |
A reaction: [summary of a verbose paragraph] The point is that you cannot define movement as change of place (contrary to Russell's proposal!). The concept of a place seems to be relative. Walking on a treadmill. |