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The Bot(i)cello is a tree-shaped electric string robot that uses fans to pluck strings of changing lengths. It has three arms, each holding an electric guitar string on one end. The arms curl in and out like the petals of a flower, and as they move they change the pitch of the string. It was designed by Christine Southworth, Yu-Cheng Hsu and Jeff Lieberman, and built in 2005-'06 by Ensemble Robot.