“Tiger and Turtle–Magic Mountain” by German art duo Heike Mutter and Ulrich Genth is a walkable sculpture shaped like a roller coaster. Visitors can walk along the track (except for the loop sections). The 69 foot tall sculpture is located in Wanheim Duisburg, Germany. The curved flight of stairs inscribes like a signature on the landscape and recruits the nimbus of the classical roller coaster.

Having a closer look, the public is disappointed in a disarming way. The visitor climbs on foot via differently steep steps the roller-coaster-sculpture. So the sculpture subtly and ironically plays with the dialectic of promise and disappointment, mobility and standstill.