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I was curious how the effect was created and found this: https://www.ignant.com/2016/01/07/an-illusory-swimming-pool-by-leandro-erlich/
Under a 10cm layer of water, the rest of the "pool" is a walk-in art exhibit. There are lots of photos in that link from both above and below the water. It's a permanent exhibit in a Japanese museum of contemporary art.