Pop Art began in England in the 1950s as a reaction against Abstract Expressionism. Key early figures included Richard Hamilton, who coined the term "Pop art", and Eduardo Paolozzi, whose collages incorporated imagery from mass media and popular culture. Pop Art spread to the United States in the 1960s, where artists like Andy Warhol, Jasper Johns, Robert Rauschenberg, Claes Oldenburg, and Jim Dine incorporated everyday objects and imagery into their work. They challenged definitions of art and blurred lines between high and low culture.