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It is like one of the riddles or charades in the plays themselves—as if the plays have spilled off the stage, and we have all become players in a comedy that the author himself set in motion. Mistaken identities abound in Shakespeare. Reputations are false. Appearances are deceptive. Things are not what they seem. “I am not what I am,” says Viola, disguised in Twelfth Night as the boy servant Cesario.
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Elizabeth Winkler (Shakespeare Was a Woman and Other Heresies: How Doubting the Bard Became the Biggest Taboo in Literature)