Have you ever read the ghost tale "Come and whistle my lad" by M.R. James, it made me think of it, the ghost following the main character back to his hotel room from the ruins he found the whistle.
It´s eerie, ghostly, and there is something dreamy, warped like a false awakening. I made a music album called The Underliving some years ago, it is also an illustrated project not only music, and it features things that ARE NOT LIVING BUT ARE ALIVE... like when you see a shadow and shape it, or when you listen to the wind and find words... it sort of evoke that Underliving realm to me. It would lose with more detail, the thing is you must to make them out in your mind, it makes it ominous mostly.