Dark closets and creepy attics are all very well and good, but after you've seen Backrooms you'll know that cavernous, office-like spaces have the power to be just as unnerving. Kane Parsons' movie, which is based on his series of YouTube shorts , which was in turn inspired by a 4chan creepypasta , takes us into a nightmarish other world that plays with the eerie concept of liminal space. But what exactly is the liminal space the characters encounter? Where does it come from? What, if anything, does it want? We've broken down the ending of Backrooms below, along with some theories. What is Backrooms about? Credit: A24 Clark (Chiwetel Ejiofor), an aspiring architect turned furniture shop owner, is trying to manage his drinking problem and process his recent separation through sessions with his therapist, Mary (Renate Reinsve). Due to his separation, he's been sleeping on the floor of his shop. Clark quickly notices that the store's lights flicker on and off after dark.…