The LA 2007 Auto Design Challenge has released this beauty on the world. The 2057 Mercedes Benz concept resembles the racers of long ago, but has a totally futuristic feel.
The designers really stretched their imaginations by making the SilverArrow from micro-metallic particles that can be arranged by magnetic fields. Those preset fields would be stored on your key ring. The entire car would be reshaped into a vat of metal, that could be stored in a barrel. When you're ready to take a spin, a touch of the key would reassemble the car in the shape you desire that day.