One of the qualities of writing that is not much stressed is its problem-solving aspect, having to do with the presentation of material: how to structure it, what sort of sentences (direct, elliptical, simple or compound, syntactically elaborate), what tone (in art, "tone" is everything), pacing. Paragraphing is a way of dramatization, as the look of a poem on a page is dramatic; where to break lines, where to end sentences.