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©Christophe Gateau/DPA/MAXPPP ; 27 May 2019, Lower Saxony, Hanover: A sound installation by Pavel Büchler plays the sound poem "Ursonate" (1932) by Kurt Schwitters. In 2019 the Sprengel Museum celebrates the 100th birthday of Merz with an exhibition of over 200 exhibits. Photo: Christophe Gateau/dpa