Narrative paragraphs have similar features of flow (or unity) and coherence. However, the development might be more related to the action or events narrated in the paragraph than to supporting an argument. Coherence in a narrative paragraph usually comes from the chronological order of the "story" or narrative. Similarly, a descriptive paragraph might find its development through giving a series of sensory details or of abstract ideas that describe an object (or concept or theory), rather than through support. These two types of paragraph - narrative and descriptive - differ only slightly in these respects from expository paragraphs, but the differences are still important.