The art installation “Wahnheit” (a pun with the words Wahn = hallucination and Wahrheit = truth) by Polish-German artist couple Katarzyna and Olaf Prusik-Lutz illuminates the walls of the Kaiserburg (Imperial Castle) during the “Blue Night” in Nuremberg, Germany, 07 May 2016. (Photo by Nicolas Armer/EPA)
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