"The Chipmunk-X1000 model Messenger Bike. small, speedy, rugged runs on a blend of peanut and sunflower oil . I had the idea of a messenger bicycle, but I wouldn't have been able to fit the chipmunk logo on a skinny bicycle frame. So, I made it a motorbike, which I have no experience of. I decided not to look at any reference photos, because I wanted to design my own. That piece of apparatus on the bottom recycles and purifies the exhaust (sure, that can happen)."  Via: The art of Jill Oelerich