Carl H. Renner painted this "Escacar" for General Motors in 1945. The Escacar is described as a "Unicycle Gyroscopic Rocket Car."
Like the painting of a commuter helicopter we looked at a few months ago, this image can be found in the Petersen Automotive Museum book, Driving Through Futures Past.
I couldn't find much information about Carl H. Renner online. If you have any information on Mr. Renner please add it to the newly created Paleo-Future Wiki.
Commuter Helicopter (1947)
Disney's Magic Highway, U.S.A. (1958)
GM Car of the Future (1962)
Word Origins: Imagineering (1940s)