The Backrooms (movie)

After a therapist's patient disappears into a dimension beyond reality, she must venture into the unknown to save him.

This movie is based on Kane Parsons take on the internet sensation of The Backrooms, which is in turn based on a 4Chan post centered around the idea of liminal spaces. It had a picture like the one I've posted and this text:

"If you're not careful and you noclip out of reality in the wrong areas, you'll end up in the Backrooms, where it's nothing but the stink of old moist carpet, the madness of mono-yellow, the endless background noise of fluorescent lights at maximum hum-buzz, and approximately six hundred million square miles of randomly segmented empty rooms to be trapped in
God save you if you hear something wandering around nearby, because it sure as hell has heard you"

This movie slots into Kanes fictional version of The Backrooms that he's chronicled here:

(3) The Backrooms (Found Footage) - YouTube

You don't have to watch these YouTube videos to enjoy this movie, but IMO it will enhance your experience.