Show, don't tell

Show, don't tell is the principle that a reader should be given the concrete evidence — action, behaviour, detail — from which they draw the conclusion themselves, rather than being handed the conclusion directly.

James Baldwin's version is the most useful, because it survives being taken literally: Don't describe a purple sunset, make me see that it is purple. The point is not that description is forbidden. It is that naming the quality does less than producing it.

The line usually attributed to Mark Twain makes the same case for character: don't say the old lady screamed — bring her on and let her scream.

What the principle is really about is who does the concluding. He was nervous is a verdict; the reader accepts it and moves on. The bitten thumbnail, the rehearsed sentence said twice, the coat kept on indoors — those are evidence, and a reader who assembles nervous out of them believes it, because they are the one who said it.

One practical refinement: when showing an action, describe what the character does rather than what they intend by it. Rather than being defensive, write the accusation they throw back. The action is tactile; the intention is a label.

It is a default and not a law. Telling is the correct tool for compressing time, for transitions, and for anything the reader does not need to experience — three years passed is not a failure of craft, it is a decision about where the pages go.