"The Seeds Gathering On His Trouser Legs"
Gjertrud Schnackenberg has a very cool knack in this introduction--she sheds light on much of what rests behind the surface of her poem. She's fit an enormous range of references in here--Charles Darwin's autobiography, Ovid's Metamorphoses, Shakespeare's Prospero, which all dovetail together quite nicely when Schnackenberg gets done explaining it.
I'm a big fan of this idea, that there is a tremendous amount of outside information behind what ultimately goes into the distilled words of a poem. The idea of a poet as a voracious reader and constant student.