I remember one dream. I was walking along some kind of cardboard corridor lined with luminous cubes. The corridor ended with an exit to the open sky and this is where the dream ends. There was something before that, but I don't remember it.
You've left something unfinished. I know that can be vague but it must be something you're unsure of since the path to the end is malleable like cardboard. I wouldn't say this relates to claustrophobia, unless it does for you in a way, like the project in real life is on a linear path with no possibility of diverting course. The final result is simple enough, hell the door was open and you saw a result you envisioned reaching at the other end. The liminal space is created by curiousity, since you were in a place you both understood and didn't.