Ancient Greek practices and philosophy stressing a movement in the world from cosmic order, represented mythologically by an original primordial egg, to a gradually developing disorder. Most scholars agree that by the 5th century BCE the Orphic movement existed, with travelling priests who offered teaching and initiation, based on a body of legend and doctrine said to have been founded by Orpheus.
Source: Art & Architecture Thesaurus
http://vocab.getty.edu/page/aat/300400850
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