Alchemical books were often profusely illustrated. Anyone familiar with the history of Western art will, however, find the images strangely timeless and possibly a little shocking. There are pictures of people tearing their own hearts out, or of bodies being dismembered. People are shown as cripples, as if to mirror their crippled or limited understanding of the art, or the world (if indeed there is ultimately a difference). Sexual imagery is strong, with the alchemical archetypes of the King and Queen frequently portrayed engaging in sexual intercourse. In others, a man has a tree growing out of his body where his penis should be. Men and women merge, not just in the sexual act, but to become hermaphrodites. It seems clear that these images were to be read or meditated upon, not merely looked at. The Swiss psychologist Carl Jung believed that, whatever sort of gold the alchemists were looking for, they had in fact discovered the unconscious, and that their frequently strong, challenging images were portraits of various states of consciousness that could lead us into a greater understanding of ourselves.