The significance of Banquo appearing at Macbeth's coronation banquet is that it reveals to the others that Macbeth may not have everything together. Up until this point everyone, besides from Macduff, believes that Macbeth is great and has everything together, but in fact this scene shows how he has slowly had a decline of goodness. In this scene, Banquo states, "Thou canst not say I did it: never shakeThy gory locks at me (3.4.61-62)." Meaning that Banquo cannot prove that he killed him, because he is dead, and he wants him to stop haunting him.
By appearing at Macbeth’s coronation banquet, Banquo shows that Macbeth does have a conscience and that he is not purely evil. This event shows that Macbeth is falling apart emotionally. This is also where other characters see that Macbeth is not what he seems to be. He may not be stable enough to be king, as he exhibits signs of insanity in front of everyone, by seeing the ghost of Banquo. Unfortunately Lady Macbeth is not able to keep the other nobles from noticing Macbeth’s moment of insanity.
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During Macbeth's coronation banquet, the ghost of Banquo appears and Macbeth is extremely disturbed by the ghost. He is the only one who can see Banquo, and he begins to yell at the ghost. The significance of the ghost appearing at this point was to show the other thanes at the coronation banquet that maybe Macbeth being King of Scotland isn't such a great idea. Who would want a King with extreme physiological problems? Also Macbeth keeps screaming at the ghost and he says that "he did not do it", which raises the question "Was Macbeth actually the one who murdered his friend Banquo?"
Macbeth is deeply disturbed by the arrival of the ghost of Banquo at the banquet and this significance shows his deep rooted regret and morality he is trying to suppress. When Banquo appears Macbeth is tormented and portrayed by others as crazy and losing touch with reality. The ghost taunts him and this further drives Macbeth to madness to the point where Lady Macbeth dismisses the others in fear of further judgment. By this point everyone is concerned for Macbeth's state of mind and this causes them to start losing faith in him as a proper king.
When the ghost of Banquo appears at the banquet, the banquet begins to get crazy. Macbeth is the only person who can see the ghost. The significance of the ghost showing up gives away Macbeth's guiltiness. The ghost continues to taunt Macbeth and causes much turmoil, giving the other people at the banquet reason to believe that Macbeth might not be fit to rule. It also shows that Macbeth might have done something wrong giving away the secret of Banquo being killed.