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Posted by Lau, symmetry is beautiful/">Lau, symmetry is beautiful on December 28, 1999 03:41:30 UTC

Lau: Consider a bucket of water, and you start spinning the bucket. The water will start to climb up the side of the bucket and the surface of the water will become concave. Now the question is how does the water know it's spinning? Relatively if we think of it as the bucket is stationery and the surrounding is moving, should the surface stay flat or concave??

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