People consider rolling all kinds of wheels... Professor Wagon's Square-Wheeled Trike
	Stan Wagon, a mathematician at Macalester College in St. Paul, Minnesota, has built a bicycle with square wheels that actually works! When he rides it on an inverted catenary “road,” it goes as smoothly as a normal bike. His bicycle has even been featured in Ripley's Believe It or Not! Professor Stan Wagon of Macalester College on his square-wheeled bicycle. From http://stanwagon.com. The bike “road” is 25 feet long. The whole apparatus is available for public riding, and resides in the Science Center at Macalester College, Minnesota.
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