@Zennistrad It’s both a reference to liminality “in between” in physical spaces, as well as temporally, spaces that are seen during periods of time where they aren’t normally used, like a school or office at night bereft of people. It’s in between the times in which it is active
So the eerieness of a location made *entirely* of empty hallways comes mostly from the understanding that they don't connect *to* anything. So being trapped in an endless hall is inhabiting a place that was never meant for habitation.
The concept of "liminal spaces" is pretty easy once you understand what "liminal" is - it literally means "in between"
These are spaces which are meant solely to connect to other spaces. To be used, but not *inhabited*. You don't usually pay much attention to what's in a hallway