I haven't studied much poetry which is why I'm asking this question to those of who write and/or read poetry. I usually don't understand why poets break their lines in unrhymed poetry when they do. The only reasons I can think of are to emphasize the last word on that line or to preserve some sort of meter. For those of you who write poetry, how do you determine when to add a line break? Do you use some kind of rule or formula (as in following meter)? Do you follow your instinct? Or do you add line breaks arbitrarily and hope for the best? I have googled this and gotten various answers, but I'm more interested in seeing what people here have to say.