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The "1" is replaced with a four-sided object, then the next one could be a five sided object, then six (the cube), but then after that, it is either a five-sided pyramid, or a eight-sided die.

Would you please give me an explanation or a rule for this image? Enlighten me, please!

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I don't see a pattern, except that the polyhedra are increasing in complexity. However, I want one of these clocks for my office! – Grumpy Parsnip Apr 8 '12 at 14:16

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