Dark, Season 2

H.G. Tannhaus:
Have you ever heard the term "bootstrap paradox"? Well, in a bootstrap paradox an artifact, or any information, is sent back to the past from the future. And this, in turn, creates an infinite cycle in which the artifact doesn't have a real origin anymore. It exists without ever having been created. To put it simply, this book has traveled back through time. It found me before I even wrote it. It's all a question of origin. Where is the beginning? When is the beginning? Is there a beginning at all? The world is full of such paradoxes.