I was captivated by the title -- "He's Not a Poet, But He Plays One" -- of a poem (found here) by Donald Illich -- and it led me to want to explore this poet's writing. Sometimes he uses mathematics -- not in major thematic ways but in very interesting ways. Below I offer a poem that illustrates my view.
Water Mathematics by Donald Illich
calculated the river and the stream,
modeled the pond under dangerous
situations. Water was really math,