A movement comprising initially British, then American artists in the 1950s and 1960s. Pop artists borrowed imagery from popular culture—from sources including television, comic books, and print advertising—often to challenge conventional values propagated by the mass media, from notions of femininity and domesticity to consumerism and patriotism. Their often subversive and irreverent strategies of appropriation extended to their materials and methods of production, which were drawn from the commercial world.