his unsurness
his lust for power
his madness
his quickness of temper
The ghost thus seems more like the manifestation of an idea—a figment of the imagination—rather than a “real” ghost. Lady Macbeth says as much when she pulls Macbeth aside: “This is the very painting of your fear; / This is the air-drawn dagger which you said / Led you to Duncan" (III iv 60-62). Just like the dagger, Banquo's ghost appears to be a realization of Macbeth's guilt. Even if the occurrence is supernatural, the event is very real for Macbeth. Thus, the vision of the ghost and Macbeth's response to it reveals madness.
