Wikipedia
The "Orpheion", also known as the Orpheion Theater, is a traditional outdoor Greek hillside theater on the Irving, Texas, campus of the University of Dallas.
The name is a Greek diminutive of Orpheus, the poet and musician of classical mythology who through his music and art could charm even the mute stones and trees to life.
The space consists of a bowl of earth, part-natural and part-man-made, (in Greek the "theatron" or 'seeing place' for the spectators to sit) that half-encircles, at the base of the bowl, a nearly circular (actually octagonal) stone stage (the "orchestra" or 'the place where the chorus dances'). Abutting the rear of the stage, in size and form variant on the needs of the particular production, is a temporary wooden structure (the "skene" or 'tent' where the Greek actors could enter and exit, and probably also change masks and costumes, etc.). This structure often holds a curtain or curtains for thespian ingress and egress. Behind the skene is a copse of oak trees, with paths for the actors and crew.