Are the three weird sisters witches, or are they just … three weird sisters? Is there really a floating dagger, or is Macbeth just making up excuses? Does he really see a ghost, or is it just the impression of his guilty conscience? Do you believe in magic? In Macbeth, the supernatural isn't just for stories around the fireplace; it's a real, everyday fact of life. Almost, you might say, natural.
Unless, of course, it isn't. To figure out what's going on with all the witches and ghosts, you have to decide whether you believe in fate. Is Macbeth seeing daggers and ghosts because someone outside his control is controlling him? Or is he simply seeing the fevered imaginings of a guilty and freely choosing mind?
Macbeth consistently undercuts the reality of the supernatural by focusing on the Macbeths' internal guilt and struggle.
In Macbeth, the supernatural represents the fear of the unknown.