Some have tried to explain the iconography of Bosch’s works through alchemy, astrology, medicine and the Adamites. Bosch’s work is rich, and seems to come from a number of sources, but he always drew from traditional Christian themes. The sinfulness of mankind is a major theme in Bosch’s oeuvre, and is bound up with the late Medieval theme of the punishments of the damned at the Last Judgment. The theme of the seven deadly sins pervades every surviving painting by Hieronymus Bosch.