I reviewed
Materialism many years ago. It is, I recall, about the time that she moved into her present manner, which involves combining small personal incidents with global themes. This is probably behind the Jstor firewall:
https://www.jstor.org/stable/3852075...n_tab_contents
I say "present manner" in reference to this poem. She has employed a variety of techniques with spacing and punctuation over the years. In this case it's primarily in the use of em-dashes.