Are you sitting uncomfortably? How Backrooms upended the horror movie

It was just a creepy picture on the internet. Now it’s the year’s freakiest film. Its 20-year-old auteur Kane Parsons and stars Chiwetel Ejiofor and Renate Reinsve take us through the terrifying labyrinth Chiwetel Ejiofor has been on a lot of movie sets, but Backrooms was something different: a 30,000 sq ft labyrinth of apparently random corridors and chambers, all carpeted, fluorescent lit and decorated in the same sickly yellow wallpaper. It was so big that people were getting lost in it, s...

By Steve Rose