That line is a good way into Dark Matter, whether you know it from Blake Crouch's 2016 novel or the 2024 Apple TV+ series. In both, the box works as a machine for regret: it shows you the lives you didn't choose, and the pull comes from seeing the paths side by side. The fiction keeps returning to that pull, not just the physics, and that's where it earns its unease. The thread about Mildred and the clones picks up a related question about how that many selves could fit in one place. If you mean the box as a temptation rather than a plot device, I'd be curious which version you watched or read, since the show handles the choice and its cost differently from the book.
Also discussed here:
- In Dark Matter, Mildred seems to be some place of quantum respite.
