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A point moving in 3d space can easily escape a 2d prison (shown in red). ...(438 × 439 (21 KB)) - 17:19, 26 November 2009
 | A point moving in 3d space can easily escape a 2d prison (shown in red).
... (438 × 439 (21 KB)) - 17:19, 26 November 2009 |