Apsaras, divine nymphs or celestial dancing girls, are characters from Indian mythology. Their origin is explained in the story of the churning of the Ocean of Milk, or samudra manthan, found in the Vishnu Purana. Other stories in the Mahabharata detail the exploits of individual apsaras, who were often used by the gods as agents to persuade or seduce mythological demons, heroes and ascetics. The widespread use of apsaras as a motif for decorating the walls and pillars of temples and other religious buildings, however, was a Khmer innovation. In modern descriptions of Angkorian temples, the term apsara is sometimes used to refer not only to dancers but also to other minor female deities, though minor female deities who are depicted standing rather than dancing are more commonly called devatas.