Otto Piene and Aldo Tambellini, Black Gate Cologne, Cologne

Black Gate Cologne is considered to be the first television show realized by visual artists. In a WDR studio (at the invitation of Werner Höfer and Wibke von Bonin), several cameras are used to record a live event with audience participation. The image and sound material is electronically condensed, with a 23-minute version broadcast on WDR on January 26, 1969.