What are the main things that poetry does which prose doesn't?
Most prose operates in a way that is concerned with outcome. If it's non-fiction, then it will be logical and chronological. It will be some kind of observation, investigation, and something along those lines. If it's fictional prose, then most fictional prose is concerned with presenting characters or beings and showing what will happen to them if they go through a set of experiences, set of scenes, or a set of events. Poetry doesn't usually do that. Of course, long narrative poems do, even short little clips of narratives do, but mostly poetry is more, how can i put it, it isn't so bothered with outcome. It's more tentative. It's a more suggestive medium and often leaves you in a state of ambiguity, ambivalence, contradiction, and irony, so that you're not fully resolved. That's mostly what happens with poetry.