Poetry is a way of being alone without feeling alone. It allows you to experience another mind, I suppose. And it does that more fully than other art forms, I think. It doesn't simply describe an experience, or a feeling, or a moment: it evokes it through, say, rhythm or tone or diction or metaphor. It creates a mood. A poem communicates before it is understood; it's not a fully paraphrasable form, which distinguishes it from other forms of writing.