Square wheel
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A square wheel is a wheel that, instead of being circular, has the shape of a square. Such a wheel can roll smoothly if the ground consists of evenly shaped bumps of the right size and curvature. Stan Wagon, a mathematician at Macalester College, has constructed a bicycle with square wheels, together with a special track for riding it on.
For other improbable wheels, see Reuleaux polygon.
External link
- Math Trek: Riding on Square Wheels, Science News Online (http://www.sciencenews.org/articles/20040403/mathtrek.asp) - contains illustrations and photos of Wagon's bicycle