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  • The umbilic torus is a single-edged 3-dimensional figure created by Helaman Ferguson as a mathematical artwork. Ferguson created a 27-inch (69 centimeters) bronze sculpture, Umbilic Torus, and it is his most widely known piece of art. The lone edge goes three times around the ring before returning to the starting point. (from Wikipedia, where you can also see the equations that define the shape)

    January 13, 2012