Re: Tired, but unrelenting.
I agree that the part Gary highlighted in blue should probably go (if it looks enough like a room that he can't tell the difference, then "room" should be good enough).
For my taste, the sentence is too flowery. For one thing, the POV character is so confused about his surroundings, I would think he'd be more interested in figuring that out than in watching the shadows as carefully as he seems to be doing, since he has so much to say about them. For another, if we are supposed to be worried about him — and the fact that he doesn't even know what sort of place he is in suggests that we should be — the frivolous and enticing shadows encourage us to do the opposite. And finally, since light and shadow have, indeed, been doing that sort of thing since the beginning of time and that's hardly news, then I don't really think that it needs to be said.
It's lovely, but I wonder if the scene needs all that.
What is he feeling just then? It would be best if what he sees in the shadows reflected his mood.