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Argentinian artist Leandro Erlich created this fake pool called The Swimming Pool, for The 21st Century Museum of Contemporary Art in Kanazawa, Japan. Leandro put two clear acrylic glasses about a foot apart and filled the space in between with water. The top surface is also filled with about 4 to 5 inches of water so that it looks like a realistic pool.

A 10 cm layer of water over a piece of glass separates above from below. It must be a pretty serious piece of glass; some back-of-the-envelope math based on the published dimensions gives 1,100 kg (2400 lbs) of water that it has to support. Plus its own weight.

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