The sphericon is a three-dimensional solid with one side and two edges. It was first introduced by the Israeli game and toy inventor David Haran Hirsch who patented it in Israel in 1980. It was given its name by Colin Roberts, of Hertfordshire, England, who also explored it.
It may be constructed from a bicone (a double cone) with an apex of 90 degrees, by splitting the bicone along a plane through both apexes, rotating one of the two halves by 90 degrees, and reattaching the two halves.
- "Mathematical Recreations: Cone with a Twist", Scientific American, October 1999
- David Haran Hirsch (1980): "Patent no. 59720: A device for generating a meander motion; Patent drawings; Patent application form; Patent claims
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- Sphericon Homepage. It contains images, text and animation that give a fuller view of the sphericon family.
- Paper model of a sphericon Make a sphericon
- Sphericon variations using regular polygons with different numbers of sides
- A Sphericon in Motion showing the characteristic wobbly motion as it rolls across a flat surface