Daniel Spoerri was a Romanian-born Swiss visual artist and writer. He is considered to be an important figure among the artists within the so-called "second wave" of the Pop art movement.

Zero was an artist group founded in the late 1950s in Düsseldorf by Heinz Mack and Otto Piene. Piene described it as "a zone of silence and of pure possibilities for a new beginning". In 1961 Günther