Warhol famously exploited the screenprint as a form of mass production, making use of both its infinite multiplicity and the subtle differences between individual prints. The development of techniques which allowed photographic source material to be enlarged and reproduced enabled Warhol to use found images from popular culture to create iconic works of art. Jackie Kennedy, widow of American President John F. Kennedy, was a cultural icon as recognisable as any pop or film star. Warhol took this image from a newspaper photograph which showed her grieving after the assassination of her husband. He has used repetition to reflect the mass production and consumer culture of America.