III
Slim adolescence that a nymph has stripped,
Peleus on Thetis stares.
Her limbs are delicate as an eyelid,
Love has blinded him with tears;
But Thetis' belly listens.
Down the mountain walls
From where pan's cavern is
Intolerable music falls.
Foul goat-head, brutal arm appear,
Belly, shoulder, bum,
Flash fishlike; nymphs and satyrs
Copulate in the foam.
William Butler Yeats
http://www.poemhunter.com/poem/slim-adolescence-that-a-nymph-has-stripped-2/