Paul Morley investigates the lasting appeal of art's very own Pop Idol. From failed Abstract Expressionist to pioneering Pop Art hero, Roy Lichtenstein revolutionised the art world with his big, bold, brash cartoon images of American culture. Even before Andy Warhol had picked up his can of Campbell's soup, Lichtenstein was making merchandise into art and cultivating his own durable brand, turning out work that was highly consumable and tirelessly reproduced.