Structural anthropology is a school of sociocultural anthropology based on Claude Lévi-Strauss' 1949 idea that immutable deep structures exist in all cultures, and consequently, that all cultural practices have homologous counterparts in other cultures, essentially that all cultures are equitable. Culture, he claimed, has to take into account both life and death and needs to have a way of mediating between the two. Mythology (see his several-volume Mythologies) unites opposites in diverse ways.