Stock Photo - 21 March 2018, Germany, Bayreuth: Former high-school teacher Klaus-Dieter Reus, who for 25 years has been researching barqoue-era stage technology, holding a wooden ball, which rumbles through a replica thunder machine. 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: Former high-school teacher Klaus-Dieter Reus, who for 25 years has been researching barqoue-era stage technology.

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