Performance art is a genre of art that uses the artist's own body as a medium. It emerged in the early 20th century from movements like Dada, Constructivism, and Futurism. Notable early performance artists included Yves Klein and Allan Kaprow, who created Happenings in the 1960s that involved audience participation. Pioneers in the 1970s like Vito Acconci, Chris Burden, and Marina Abramovic tested the boundaries between artist and viewer. Abramovic's 1974 piece Rhythm 0 had dangerous elements. Performance art gained more mainstream acceptance in the 1980s and 1990s, with works by Linda Montano and Tehching Hsieh and Karen Finley.