> But I think they also had to move to a replica because of possible damage to the art from so much human breathing or similar?

Yeah, makes sense that'd eventually damage it. Also people moving around pushing the air around. The fact that time stood still in the places is probably the reason they're so well preserved in the first place.

Wonder if you could like glass them in or something, to really isolate them? Feels kind of sad knowing I'd damage the drawings by visiting them in person, but also really want to see them.