Some of the oldest extant literature, such as the Sumerian temple hymns of Enheduanna (c. 23rd century BC) are liturgy addressed to deities and thus technically "prayer". The Egyptian Pyramid Texts of about the same period similarly contain spells or incantations addressed to the gods. In the loosest sense, in the form of magical thinking combined with animism, prayer has been argued as representing a human cultural universal, which would have been present since the emergence of behavioral modernity, by anthropologists such as Sir Edward Burnett Tylor and Sir James George Frazer.