What is a poem? In high school the joke was anything with a jagged right margin. Hence a "prose" poem (or maybe that's a prose "poem"). Dan Chiasson has something to say about this in his review of Carl Phillips' twelfth collection
Silverchest :
Many fine poets would retain their power even if their poems were printed as prose. … The prosiest poets would not: there is no William Carlos Williams, or H.D., or George Oppen, without line breaks. Phillips is one of the latter.
And as an example: "The trees wave but, except to say 'wind—up again,' this means nothing." Your mission, should you decide to accept it, is to break the quote and turn it into poetry. You can check your efforts against the original in the latest, 4/15/13
issue … Oh, how annoying! It's behind
The New Yorker paywall! (Paying to read a poetry review—the idea!). I'll post the "answer" as a comment (below).
Carl Phillips, by the way, we've come across him in three anthologies we've read, most extensively in
Word of Mouth. He's gay and black but doesn't make much of either. Notwithstanding, a very fine poet.