I got on a horse when I was about 12 years of age, and started galloping around. my mother came up said "where did you learn to ride a horse?" I said "this is the first time I've ever been on a horse" I just knew, I just felt the horse.
My mother was born in the city, my dad was an immigrant. Probably from Germany. Could have been Austria, could have been Poland. The borders were changing. My dad brought over a large family of Shatners when he was very young. Scraped together the money, got 11 brothers and sisters a passage on the boat. There's a lot of Shatners in Montreal.
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.