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©Jan Scheunert/ZUMAPRESS.com/MAXPPP - December 27, 2018 - Duisburg, North Rhine-Westphalia, Germany - People can be seen walking on the 'Tiger and Turtle ‚Äì Magic Mountain' art installation in Angerpark, Duisburg, Germany. Designed by ULRICH GENTH and HEIKE MUTTER in 2011, it is 21 meters tall, made out of tin, zinc and steel. It resembles a roller coaster but is completely walkable, except for the loop.