Stock Photo - 21 March 2018, Germany, Bayreuth: Carpenter Harald Holl working on a wind machine built to baroque-era specifications. Effect machines in the Margravial Opera House in Bayreuth are to show future visitors how rain, thunder and wind used to be simulated during opera performances. Photo: Armin Weigel/dpa. - Bayreuth/Bavaria/Germany

Stock Photo: 21 March 2018, Germany, Bayreuth: Carpenter Harald Holl working on a wind machine built to baroque-era specifications. Effect machines in the Margravial Opera.

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