[quote=@Hank]
<Snipped quote by Peik>

If that's true, it (potentially) means the Dwemer were fine with sharing their living spaces with ghosts, which strikes me as odd. 
[/quote]

Well, they [i]are[/i] Dwemer. I don't know. Yagrum Bagarn himself says he's the only living Dwemer, so maybe those ghosts were added for an extra spook challenge in the Dwemer Ruins.