Created by German industrial designer Stefan Wallmann, the Zweistil prototype bike is something of a modular design, with a sci-fi twist: not only is it a bike, it's also a transformer.
One riding position is ideal for urban action: during city travel, where agility is paramount and traffic awareness is key. The other setup is more of a "cruiser" configuration, providing a comfortable ride for traveling long distances and for leisure cruises, back and low, so you can kick back and enjoy the scenery.
At this point, it's only a prototype now, but if it works as well as the video seems to indicate, we wouldn't be surprised to see these on the street, very soon.
Source: The Design Blog