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Why did Sidney Lumet film nearly all of 12 Angry Men in a jury room?

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Sidney Lumet chose to film nearly all of his 1957 directorial debut, 12 Angry Men, within a single jury room to establish a claustrophobic atmosphere.1

By confining the cast to this restricted setting, Lumet effectively heightened the tension created by the combustible personalities of the 12 jurors as they deliberated on a murder case. This deliberate choice in staging, combined with two weeks of intensive rehearsals, allowed the director to transform a simple jury room into a space that emphasized the film's intense exploration of conscience and justice.12