"look not like the inhabitants of the earth, / And yet are on it"
This juxtaposing comment further works to reassure the confusing and illogical nature of the Witches, This suggests
their introduction to the characters, especially Banquo and Macbeth, will be chaotic.
• Links to Banquo's later comment: "you should be women, / And yet your beards forbid me to interpret / That you are so." - The Witches clearly work beyond the natural laws of physics and biology.