A Folding, Stackable Car
"A team at the Cambridge, Mass.-based university is working on a design project for the City Car, a foldable, stackable two-seater vehicle. No, that's not a typo. The frame of the car is designed to fold in half so the cars can be stacked up eight deep in one city parking space."
"Time magazine recently named the project one of the Best Inventions of the Year. According to [Franco Vairani, a Ph.D. candidate at MIT and one of the original designers in the City Car project] the team is trying to rethink the relationship between cities and automobiles."