As regards Shakespeare's Twelfth Night, what does "one face, one voice, one habit, and two persons a natural perspective that is and is not" mean?

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sensei918 eNotes educator| Certified Educator

In Shakespeare's Twelfth Night the two main protagonists are Sebastian and Viola. They are fraternal twins, but apparently they look enough alike that Viola, thinking Sebastian is dead, and being a young woman alone in the world, disguises herself as a young man and gets away with it. In fact, she is so successful that the Lady Olivia falls in love with her, thinking she is, indeed a man. Then, when Sebastain shows up, Olivia thinks that he is her love Cesario (Viola in disguise). When the twins are finally reunited, Antonio comments that "An apple cleft in two is not more twin/Than these two creatures" (V,i,234-5). They look so much alike that they seem to be "one face, one voice, one habit, and two persons"