There is nothing in the world that has not already happened, been seen, or been created; things exist now as they always have. Sometimes used for hyperbolic effect. Another war has broken out, and people continue to kill one another for land and ideology. There's nothing new under the sun. A: "Man, that action film had no relatable characters and a plot so thin that I can't even remember what it was about." B: "Yep, it was a standard action film, all right—there's nothing new under the sun."