Lol.
This has reminded me of how my friend's house growing up had a toilet at the top of the stairs, coming off a communal seating area.
The toilet just randomly had no door.
Her parents had built the house so I've never been completely sure why they were capable of building an entire four bedroom house which doors to every room, but stopped short of putting a door on the toilet.
When they were teens the hung up a kind of batique sarong thing to cover the door.
But obviously it did nothing to block out the sounds. Or the smell.
😐