Traditionally, Theravada Buddhism has observed a distinction between the practices suitable for a lay person and the practices undertaken by ordained monks (in ancient times, there was a separate body of practices for nuns). While the possibility of significant attainment by laymen is not entirely disregarded by the Theravada, it occupies a position of significantly less prominence than in the Mahayana and Vajrayana traditions. This distinction - as well as the distinction between those practices advocated by the Pali Canon, and the folk religious elements embraced by many monks - have motivated some scholars to consider Theravada Buddhism to be composed of multiple separate traditions, overlapping though still distinct. Most prominently, the anthropologist Melford Spiro in his work Buddhi