Even one word, or certainly one sentence, should be able to...

Even one word, or certainly one sentence, should be able to describe the basic characteristic that the scene has, or the character has, or the story has. And then you begin to detail that one spine, and you have offshoots from that spine, and it becomes more and more complex, but all of it stems from that one-word, one-line theme, which can give the character, the scene, or the play its uniqueness.