Williams has the reader learn about Blanche's true history while she is out of the room. How does that dramatize or heighten the suspense of the succeeding scene?
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By keeping Blanche out of this denouement, Williams heightens the suspense of the succeeding scene. Everyone knows the truth about Blanche now – the Kowalskis, Mitch, Blanche, the audience – and all that remains is for Blanche to know that they know. In a play like Streetcar where much of the action has occurred off-stage in the past, it is an effective dramatic device to have the audience know more information than the protagonist. This device camouflages a lack of action and lends a drumming inevitability to the succeeding scenes, while elevating the meaning of everyone's actions – we know what they're thinking, and we are just as tense about it as they are.