^ You mentioned liminal space, as I did. The first time I'd heard of the concept I thought it was nonsense because I was only hearing it presented as an abstraction, but not visually. I then thought of it as interstitial space (architectural) in a building, but liminal is different, usually a transition from what was, to what will be; this can create some uncomfortable and eerie feelings, perhaps with a form of tension, suspense, or foreboding, present in the photograph.
I really like the following video, it's fun and explains this photographer's version of it:
• Video Link