Jasper Johns was an important 20th century artist instrumental in the development of Pop Art, Conceptual Art, and numerous other movements in Europe and the US. Though a series of flag and target images that outraged the art world, Johns transformed ordinary objects into fine art. Johns, who began his career in commercial art, challenged and altered the basic principles of painting, and has explored countless unconventional art forms. He often repeats the same subjects with different techniques to examine the relationship between an image and its medium.