Term used from about 1970 to describe changes seen to take place in Western society and culture from the 1960s on. These changes arose from anti-authoritarian challenges to the prevailing orthodoxies across the board. In art, postmodernism was specifically a reaction against modernism. It may be said to begin with Pop art and to embrace much of what followed including Conceptual art, Neo-Expressionism, Feminist art, and the Young British Artists of the 1990s. Some outstanding characteristics of postmodernism are that it collapses the distinction between high culture and mass or popular culture; that it tends to efface the boundary between art and everyday life; and that it refuses to recognise the authority of any single style or definition of what art should be.