http://images.businessweek.com/ss/09/08/0824_worlds_coolest_bikes/10.htm

Folding bikes have been around for a while, but this one is particularly compact. The aluminum frame attaches to the wheels via a single fork to reduce the width when folded. The seat retracts into the frame and the pedals and handlebars fold together. The chain is hidden away to stop grease from smearing on the rider.