insane by the end of the play. The death of his father and loss of contact with his lover begin driving him to insanity. We can say with some certainty that the ghost is real on its visit to Hamlet because others witness it, but after the death of Polonius, Hamlet is its only witness. By this point Hamlet must surely be insane. He has been brooding for so long over how he will get revenge and just as he thought it was at his fingertips, it
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