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Sand performance art - 19MB, but a fast server and complete utter magic. Pictures being created in sand, and the way one flows into another. Each frame of this animation could make a great wall hanging. I'm awed :D

ETA: The guy's homepage has three more videos, but they're really short and bad quality. On the other hand, the site also has his paintings (niiice) and other information if y'all are interested.