That same year Nauman had his first solo exhibition, at the Nicholas Wilder Gallery, Los Angeles; this was followed by more solo exhibitions in 1968 at galleries in New York and Düsseldorf. Nauman also quickly made his name abroad. Following his first participation in documenta in Kassel (1968), he showed work in groundbreaking group exhibitions such as “Anti-Illusion: Procedures / Materials” at the Whitney Museum of American Art, New York, and “When Attitudes Become Form” at Kunsthalle Bern (both 1969). In 1972–73 the Los Angeles County Museum of Art and the Whitney Museum of American Art presented the first retrospective museum exhibition of Nauman’s work.