Visitors watch the upside down hanging sculpture of the Matterhorn mountain at the exhibition “The Call of the Mountains” in the Gasometer in Oberhausen, Germany, Thursday, March 15, 2018. The highlight of the exhibition in the 100 m high space within the former Gas cylinder is a monumental sculpture of the Matterhorn using 3D technology to show moving images as the mountain changes from day to day and season to season. (Photo by Martin Meissner/AP Photo)
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