Early works were composed using simple schema such as flags, maps, targets, letters and numbers. These subjects were used over and over again as continuous series. Johns' treatment of the surface is often lush and painterly; he is famous for incorporating such media as encaustic and plaster relief in his paintings. Johns played with and presented opposites, contradictions, paradoxes, and ironies, much like Marcel Duchamp (who was associated with the Dada movement). Johns also produces intaglio prints, sculptures and lithographs with similar motifs.