1922-2011 1927-2006 1929- 1938-2011 1940- 1946- 1952-2013 1954- 1963- 20thcentury acconci allan art artandsociety artistcouples artisticcollaboration artistsandmuseums bruggen coosjevan criticismandinterpretationkaprow criticismandinterpretationoldenburg dennis exhibitions exhibitiontechniques fred förg gillian günther hamilton happening happenings(art) history jeff kaprow modern motives museumsinart oldenburg oppenheim politik richard themes unitedstates vito wall wearing whitneymuseumofamericanart wilson