The Thrust theatre reference article from the English Wikipedia on 24-Apr-2004
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Thrust theatre

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A Thrust Theatre is a theatre which has audience seating on two sides of the performance space. A related term is the modified thrust theatre, which has audience on three sides of the performance space.

Thrust is not the dominant format in Western theatre; the dominant form of stage is the proscenium stage. Thrust, like Arena stage, is mainly a creative alternative to the proscenium format.