Shakespeare uses contrast and repetition to establish that the witches' value are the opposite of normal , " fair is foul and foul is fair " .
The witches are used to create dark magic and suspense .
The witches are evil , powerful and manipulative.also stagecraft is an important factor in presenting how unnatural they are . The witches speak in an ambigious way to trick macbeth .
It is Banquo who first describes the Witches. His words in Act 1, Scene 3 depict the Witches as stereotypical hags – 'withered' and 'wild', unearthly beings ('That look not like th' inhabitants o' th' Earth') with 'skinny lips', chapped ('choppy') fingers and beards (1.3. 40–46)
