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When Jonáš Gruska is not busy giving workshops on urban sonification, creating his own recording instruments, making electromagnetic fields audible or organizing a solar-powered (experimental) music festival called SVUK, you’ll find him under bridges, inside bridges, in ventilation systems or near oil refineries exploring the psychoacoustic properties of sound in industrial spaces

This piece of sound equipment emits low frequency infrasound waves, which causes those in its path to release the contents of their bowels—or more colloquially, to “shit themselves”. This kind of sound cannon has its roots in sonic weapons first developed by the Nazis for the purposes of crowd control, and purportedly also by the French authorities during the Paris riots of 1968