Which type of theatre is sometimes called a "picture frame" theatre"?

Name: Which type of theatre is sometimes called a "picture frame" theatre"?
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A proscenium arch stage is sometimes called a "picture frame" theatre because the arch frames the action on stage like a picture frame. This type of theatre is characterized by a large, rectangular stage with a frame around the stage opening, separating the stage from the audience.

Which Type of Theatre Is Sometimes Called a "Picture Frame