A monowheel, called “The Dynasphere”, built in 1932 by John Archibald Purves, 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.
THE PORTABLE LIVING ROOM
Created in 1967 by german Walter Pichler, this Helmet looking TV was a concept model of a portable TV that viewers wears on their head and get isolated from external sound and light. This was never mass produced but remained in the design books as a classic.