Unpublished archival material looking back on one of the most far-reaching avant-garde art movements in mid-century Europe The ZERO avant-garde movement was founded in D sseldorf in the 1950s by Heinz Mack and Otto Piene, who called it "a zone of silence and pure possibilities for a new beginning." Each traditional concept of art invited a different challenge. Kinetics and light replaced brush and canvas; the studio became...