<a href="http://www.stanwagon.com/">Stan Wagon</a>, whose work was featured in several Mathoverflow posts (e.g. <a href="https://mathoverflow.net/a/178359/1508">an unexpected image</a>, <a href="https://mathoverflow.net/a/92558/1508">Gaussian prime spirals</a>), has also <a href="http://stanwagon.com/public/RipleysWithCopyrightNotice.jpg">an entry</a> in <i>Ripley's Believe It or Not</i> due to his Square Wheel Bike.