Another thing.

One of the private universes went bad. So they locked the door. A deeply scary idea. A sealed cellular automaton based universe. Perfectly! Deterministic therefore ultimately incapable of escaping its history. Perfectly sealed. Therefore, incapable of salvation from the outside. And once the gate is lost, perfectly lost forever.

It’s similar to solipsistic Nation guy. Trapped in a personal universe where he’s enjoying climbing a skyscraper forever.

I think about that a bit. It’s got a deep scariness