Can you imagine riding a tricycle with square wheels? Can you imagine that this tricycle would give you as smooth a ride as a traditional tricycle? A New York Times article (Chang 2011) described a tricycle that had square wheels but that could be ridden “smoothly around a circular path ridged like a flower's petals.” It then explained that the ridged surface on which the tricycle rode undulated such that “the tricycle's axles—and the rider—remain in the same height as they move.”

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Edited by Ron Lancaster,, University of Toronto, ON, Canada, and Brigitte Bentele,, Trinity School, New York, NY

Contributor Notes

Douglas Wilcock,, recently retired as a mathematics, statistics, and economics teacher at Cape Cod Academy in Osterville, Massachusetts. He remains interested in finding mathematical applications from the world around us.

(Corresponding author is Wilcock
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