On: 'Mathematically perfect' star system being investi...

[wombatpm]

Orbitals - The Tiny Houses of solar scale structures

[ben_w → wombatpm]

Every megastructure is an invisible dot compared to the next size up.

https://www.youtube.com/watch?v=JvKSRKT0nzM

[arethuza → ben_w]

There is also The Ring in the Xeelee universe - which is millions of lightyears across:

https://xeelee.fandom.com/wiki/The_Ring

Mind you it might not count as it's a means of escape, not a place to live.