the finish line

The pictures show a 3D printed Mobius strip of Level1 of the popular Super Mario Bros. game. The whole level is wrapped around itself in a single surface, so that Mario begins and ends at the same spot every time.

source: http://www.shapeways.com/blog/archives/1635-mario-in-a-3d-printed-mobius-strip-runs-on-forever-and-ever.html