I think it’s gregors sister
It basically empasizes the "eleven stars" and the "hot sky". It depicts the tree in the painting as if made of hair.
Hope this helps
George Herbert, "The Collar" - cacophony
John Donne, Sonnet 10 - paradox
John Donne, "The Sun Rising" - hyperbole
Andrew Marvell, "To His Coy Mistress" - carpe diem
John Donne, "The Flea" - synecdoche