What it lacks in practicality, the Circular Bike makes up for in fun and an interesting take on bike culture. Salvaged from nine bikes, it's a modular design, so it can be taken apart and put back together again. The creator/designer likes to leave it in public places so a variety of riders can take it for a spin.
Read more about The Circular Bike, a.k.a. "Vicious Cycle" in TreeHugger.
Credit: Robert Wechsler