There's a theory: if ever anyone discovers exactly what the Universe is for and why it is here, it will instantly disappear and be replaced by something even more bizarre and inexplicable. There's another theory: this has already happened.
I haven't gone through every case, but it seems that's a general principle of the game.
It's as if "Below the Stack" is still going to the past - just further into the past.
Coincidentally, that's also how I play.