a study of worn-out frying pans by christoper jonassen (kinda looks like the moon)

heike mutter + ulrich genth: tiger and turtle - magic mountain

"introduced to the public on 13 november 2011, 'tiger & turle - magic mountain' by hamburg-based
duo heike mutter / ulrich genth is a large walkable outdoor sculpture on the heinrich hildebrand höhn
in duisburg, germany. resting on the highest point of the undulating park, the rollercoaster-like
structure allows visitors to walk along its elevated lanes with views of the western ruhr."

"pulling from the rolling nature of the landscape, the three-dimensional sculpture features

a one meter-wide flight of stairs that curves and rises in expressive gestures. much like an actual
rollercoaster, the winding path eventually bends in on itself into a complete - but unwalkable - loop.
the piece required extensive engineering and was developed in collaboration with german architect
arnold walz. LED-lights have been incorporated into the handrails to illuminate the sculpture at night."

quoted from designboom.