Macbeth has three key hallucinations that play a considerably important role in the development of his character: a dagger, the ghost of Banquo, and four apparitions while visiting the prophesying witches.

What was Macbeth's second hallucination?

The hired assassins have killed Banquo and Macbeth has his second hallucination. “This is the very painting of your fear,” Macbeth has just seen the ghost of Banquo and Lady Macbeth is trying to shake him out of his feeling of guilt and fear(3.4. 1348).

What illusions does Macbeth see?

Macbeth's hallucinations symbolize the dangerous aspect of unchecked ambition. In the events preceding King Duncan's murder, Macbeth sees “A dagger of the mind, a false creation / Proceeding from the heat-oppressèd brain” that leads him to King Duncan's room (Shakespeare Act II Scene iii Line 50-51).