Duh. Found this article on the natre website:
http://www.nature.com/news/2006/060515/full/060515-17.html
One can spin a bucket of water with a 13 to 20 cm diameter at a speed of 1 to 7 hertz and you get standing symmetrical geometric waves in the bucket. Changing the speed of rotation leads to different shapes, three pointed stars, hexagons, and others.
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