Why drive on four wheels where you can drive on one? In the early 1930s, Scottish engineer J.A. Purves created a zany monowheel vehicle called the Dynasphere. Purves viewed the monowheel as an alternative to traditional automobiles like the Model-T Ford. Imagine sitting inside a giant tire that rotates around you. That’s how the Dynasphere worked. Only the Dynasphere didn’t really work like it was supposed to. The vehicle has issues with stability and maneuverability. It looks like a clown car. No wonder it failed.