A MONOWHEEL built in 1932....

A monowheel called "The Dynasphere" was built in 1932 by john Archibald Purves, it was
inspired by a sketch made by Leonardo Da Vinci. It was a hard and dangerous vehicle to drive,since you had to lean your body in the direction you wanted to go, like you can see in this photo of Archibald's son driving the Dynasphere in the beach. osm facts article is best for more classic and historical piece of arts!