"Fair is foul and foul is fair": How does this relate to what the witches say or their prophecies? How does appearance versus reality connect with this sentence? In real life, we should not judge people on their appearances. There are many people who look trustworthy but are not. The witches do not look trustworthy, yet Macbeth trusts them. Is this Shakespeare's version of reality versus appearance?   

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"Fair is foul and foul is fair" establishes one of the main themes of the play and goes far deeper than simply trusting or not trusting in physical appearances. On one level, Shakespeare does say that we should not trust people simply based on their appearance. This is a major flaw in Duncan's character: he is too trusting and not able to discern enemies in his midst. This makes him susceptible first to Macdonwald's treachery and then to Macbeth's. But a deeper question the play asks is how to get to the reality that lies beneath appearance. Duncan, seemingly, has every reason to trust Macbeth fully: he is his cousin, and he has fought valiantly and beyond the call of duty to defeat Macdonwald and protect Duncan's reign. Why would Duncan have the least reason to suspect treachery? On the surface, none. However, had he gotten to know Macbeth beyond surface...

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