The ritual of divination, called Ifa, forms the basis for the Yoruba religion. Performed by highly trained priests, called babalowo, "fathers of the secret". Using 16 palm nuts, Ifa priests "cast Ifa" to determine which oral literature verses (odu Ifa) to recite in response to questions or problems. The wooden tray is bordered by relief carvings and features the face of Eshu, the messenger of the Gods. The 8 marks of an Odu If a are then made in the iyerosun wood dust sprinkled on the tray, and the pertinent verses associated with the Odu are chanted. There are 256 possible combinations (16 X 16). He will cast Ifa again to determine what sacrifices must be made, and to whom, so that life can be continually happy.