Group Zero or Group O, often referred to simply as Zero. German group formed in Dusseldorf in 1957 by Otto Piene and Heinz Mack, joined in 1960 by Gunther Uecker. A number of other artists were associated or exhibited with Zero, most notably Yves Klein and Jean Tinguely, as well as Pol Bury and Daniel Spoerri. The name refers to the countdown for a rocket launch and according to the group is meant to evoke 'a zone of silence (out of which develops) a new beginning'. Zero was in reaction against the subjective character of the prevailing Tachisme or Art Informel and practised a form of Kinetic art using light and motion that they felt opened up new forms of perception. Three issues of a journal, Zero, were published, in April and October 1958 and July 1961. The group dissolved in 1966.