"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 ...
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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)
