Pop art is an art movement that emerged in the mid-1950s in Britain and the late 1950s in the United States. Among the early artists that shaped the pop art movement were Eduardo Paolozzi and Richard Hamilton in Britain, and Robert Rauschenberg and Jasper Johns in the United States. Pop art presented a challenge to traditions of fine art by including imagery from popular culture such as advertising and news. In pop art, material is sometimes visually removed from its known context, isolated, and/or combined with unrelated material.