in The Stanley Parable: Ultra Deluxe, one path takes you to a catwalk into the top of the monitor room and the narrator mentions that seeing the room now is a big spoiler. meanwhile, if you look at the top right monitor above the door, clippy can be seen actually spoiling the plot of the main story.
Controversial Opinion: this sub isn't for the exact definition of liminal spaces. I'm here for pictures that give me the nostalgia willies. Sometimes there's bland pictures of a plain regular hallway, sometimes there's kooky dream places. The former is by definition liminal, but I prefer the latter.