Visions, light & dark in Act I

Act I
Visions:
"My thought, whose murder yet is but fantastical, shakes so my single state of man that function is smothered in surmise, and nothing is, but what is not." (Shakeapeare, p.12)
This is the beginning of Macbeth's visions, his very first illustrations of murder before his future descent into insanity.


Light and darkness:
The witches will meet again with Macbeth "at the set  of sun", at dark p.3
Macbeth and Lady Macbeth plan  to kill Duncan in his sleep, at night, when it's dark p.23