 He represented Germany at the Venice Biennale in 1967 and 1971, and exhibited at documenta in Kassel, Germany, in 1959, 1964 and 1977.In 1985, he exhibited at the São Paulo Biennial.Piene's solo exhibitions include retrospectives at the Kunstmuseum im Ehrenhof, Düsseldorf, in 1996 and at the Prague City Gallery Prague, in 2002, and a show at the Museum am Ostwall, Dortmund in 2008-2009.