A number of times in Macbeth, Macbeth sees or hears strange things: the floating dagger, the voice that says he's murdering sleep, and Banquo's ghost. As Macbeth himself wonders about the dagger, are these sights and sounds supernatural visions or figments of his guilty imagination? The play contains no definitive answer, which is itself a kind of answer: they're both. Macbeth is a man at war with himself, his innate honor battling his ambition. Just as nature goes haywire when the normal natural order is ruptured, Macbeth's own mind does the same when it is forced to fight against itself.