Continuing on from the recent post about the Mirror's Edge abstract digital game spaces, here's another:
Text from Prosthetic Knowledge
Proun - Indie game - 3rd person racer with abstract landscape graphics
Proun is a strange racing game in a world of geometric objects and large coloured surfaces. You avoid obstacles by rotating around a cable in order to gain as much speed as possible. There is no up or down; there is only the cable to which you are attached.