The fundamental elements of a story’s structure are proportion and order. Managing proportion is the art of making some things big and other things little: of creating foreground and background; of making readers feel the relative importance of characters, events, ideas. Often this means upsetting normal expectations by finding a superficially trivial detail or moment that, on closer examination, resonates with meaning.

– Tracy Kidder & Richard Todd, Good Prose: The Art of Nonfiction (2013), 40.