J. J. Abrams, the mind behind LOST and the Cloverfield franchise, has a narrative idea called a mystery-box. A story keeping a secret can engross its audience; just owning a box with a question-mark on it “represents infinite possibility,” says Abrams. “It represents hope. It represents potential.”
Compare this to the idea of “the magic circle.” Says Dutch historian Johan Huizinga, quoted from this Wikipedia article,
All play moves and has its being within a play-ground marked off beforehand either materially or ideally, deliberately or as a matter of course. Just as there is no formal difference between play and ritual, so the ‘consecrated spot’ cannot be formally distinguished from the play-ground. The arena, the card-table, the magic circle, the temple, the stage, the screen, the tennis court, the court of justice, etc, are all in form and function play-grounds, i.e. forbidden spots, isolated, hedged round, hallowed, within which special rules obtain. All are temporary worlds within the ordinary world, dedicated to the performance of an act apart.
Fiction is a space where literally anything can happen. Many fictional worlds follow certain rules for the sake of narrative consistency, but these rules are largely self-enforced by the storyteller and often disagree with the rules of our reality. When we engage with a story, we cross into a magic circle and accept an alternate mode of existence.