The proscenium arch stage is so named due to the proscenium arch which separates the stage from the auditorium.
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A proscenium arch is a type of stage
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A proscenium arch is the area that surrounds a theaters stage
opening.
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Proscenium - 2012 was released on:
USA: May 2012
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The proscenium type theatre is surrounded by the proscenium
arch, so is it's name, and it originated during the Italian
Renaissance, in the 16th century (or 1500s)