I’ve seen several examples of a single wheeled powered vehicle where the rider is positioned on the inside, but none are any cooler than the 2 passenger “Incredible Dynasphere”. The inventor, Dr. J.A. Purves, claimed that his spherical locomotion technology would revolutionize the transportation industry.
Well, it’s been a while, but we still aren’t riding around inside a big wheel. But then again, everyone doesn’t have a flying car or a personal jetpack either, so maybe its time will still come.