"fair is foul and foul is fair" -> act 1, scene 1
-> Fricative allows the line to be memorable to the audience
-> The fricatives also make the line sound threatening, making the audience feel apprehensive
-> Macbeth says "so foul and fair a day I have not seen" in act 1, scene 3: this foreshadows his later involvement with the witches:
In this quote, Macbeth is commenting on the strange and paradoxical nature of the day. The day is "foul" because it is characterized by thunder, lightning, and a general sense of darkness and evil, but it is also "fair" because Macbeth has just been named Thane of Cawdor, a high-ranking title that he had not expected to receive.
This quote sets the tone for the rest of the play, as it introduces the idea of the ambiguous nature of reality and the blurred lines between good and evil. It also foreshadows Macbeth's own internal struggle with his ambition and his eventual descent into darkness and madness.
-> The witches speak in trochaic tetrameter, while other characters speak in iambic pentameter, which gives the impression that the witches are evil, since they speak in a rhythm that sounds like a chant