According to Osho, the craziest thing with no purpose is his own speaking and presence - his whole work. He calls it utterly purposeless, like roses blooming, a bird on the wing, stars or morning dewdrops: sheer play and joy. Free from goals and consistency, he speaks, forgets, moves on - valuing spontaneity over purpose.
He’s saying his talks exist just for the joy of it, like flowers blooming, not to achieve anything.