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Proscenium arch

A proscenium (Ancient Greek: προσκήνιον, proskḗnion) is the virtual vertical plane of space in a theatre, usually surrounded on the top and sides by a physical proscenium arch (whether truly "arched" or not) and on the bottom by the stage floor itself, which serves as the frame into which the audience observes from a more or less unified angle the events taking place upon the stage during a theatrical performance.

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