"Heinz Mack (born March 8, 1931) is a German artist. Together with Otto Piene he founded the ZERO movement in 1957. He exhibited works at documenta in 1964 and 1977 and he represented Germany at the 1970 Venice Biennale. He is best known for his contributions to op art, light art and kinetic art." - (en.wikipedia.org 30.10.2019)
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