If you’re asking what household item doesn’t actually change, but would be considered extraordinary by someone in a medieval setting, and function and be useful in that environment, I’d say matches.
It sounds like China had a primitive chemical match well before Europe, but that it wasn’t until the early 1800s that Europe had the match in common production, so I’d guess that a European fantasy setting likely wouldn’t have matches.
I’m not sure exactly what you mean.
If you’re asking what household item doesn’t actually change, but would be considered extraordinary by someone in a medieval setting, and function and be useful in that environment, I’d say matches.
https://en.wikipedia.org/wiki/Match
It sounds like China had a primitive chemical match well before Europe, but that it wasn’t until the early 1800s that Europe had the match in common production, so I’d guess that a European fantasy setting likely wouldn’t have matches.