Gestus
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Gestus is a term often used when referring to Brechtian theatre. A gestus is the physical gesture which defines a character in a theatrical production. It is never meant to be cliché, but is the unique, physical representation of a particular character in a play. It removes the audience from the character's emotions, as the character simply uses a gestus to represent those emotions.
Gestus is the general idea of matter, and is to get rid of superficiality through selective realism.
Closely aligned with behaviorism, it describes a combination of gesture and gist, attitude and point - it excludes the metaphysical, the subconscious and the psychological unless they can be grounded in concrete terms. "All feelings must be externalised."