When the pieces are sculptural ceramics, huacos are characterized by pictorial richness. There are many kinds of pots and containers covered with gaudy polychrome motifs, usually anthropomorphic representations of animals or mythological, erotica, etc. Two-toned Moche pottery is characterized by complex painted scenes detailing a narrative level. Examples of erotic huacos (Spanish: "huacos eróticos"), make the Moche's 800-year period ("c." 200 BC to "c." 600 AD) the longest unbroken erotic ceramics tradition in the world, unique in the history of mankind. In the 1570s during the Spanish conquest of Peru, Viceroy Francisco de Toledo and his clerical advisers worked to destroy many erotic huacos, though some extant artifacts have survived.