If there's one area of technology that seems permanently mired in the '70s, it's that of the fold-up bicycle. In fact, the last innovation we can recall is Sir Clive Sinclair's A-Bike from 2006, but it's still big enough to be difficult to carry around. That's what inspired the folks at Impossible Technology to try and re-invent the commuter bicycle for the modern era. Rather than using straight lines, the Impossible Bike is based on two circles, from which wheels pull down and the seat and handle extends out from the top. The hard plastic carrying case which protects the unit when folded down - small enough to fit into a backpack - pulls double duty as the seat.