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you know those billboards that rotate between two ads? how would I make one, but smaller, and so it works manually? Answered

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Default117 (author)2009-03-10

You can use several triangular prisms with a crank

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Oryctolagus habilis (author)2009-03-09

Hmmm... off the top of my head, it would probably involve window shutters; the functional kind designed for indoors.

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