Final answer:
Macbeth sees the ghost of Banquo sitting in his chair at the feast, reflecting his guilt and psychological unrest.
Step-by-step explanation:
In Macbeth, during the banquet scene, Macbeth sees the ghost of Banquo sitting in his chair when he returns to the feast. This haunting vision is a manifestation of Macbeth's guilt over having orchestrated Banquo's murder, reflecting the psychological turmoil that Macbeth experiences following his rise to power. Lady Macbeth attempts to dismiss the apparition and to persuade the guests that her husband is merely unwell, but the damage to Macbeth's composure is evident.