In analyzing Shakespeare's use of the dagger in "Macbeth," the following two interpretations can effectively explain its significance:
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Macbeth’s sight of the dagger, which is not actually there, indicates his insanity. This interpretation suggests that the vision of the dagger represents Macbeth's deteriorating mental state as he grapples with the moral implications of murder and ambition.
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Macbeth’s guilt for thinking about killing the king has triggered its appearance. This interpretation highlights how Macbeth's inner turmoil and guilt manifest in the form of the hallucinated dagger, symbolizing his conflicted conscience as he contemplates regicide.
These interpretations underscore the psychological themes in the play and illustrate Macbeth's struggle with his ambitions and their consequences.