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A giant soap-bubble machine.
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The discovery of Perspective Projection, in Middle Age, with direct applications in painting and architecture.
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Leonardo DaVinci's famous bridge, which is stable despite lack of any glue or nails.
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A binary clock, to demonstrate different numbering systems. It reads 14:04:57 (h:m:s)
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Reflections and symmetry, this time five-folded
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