The title of the new documentary Room 237 — which opens in New York this weekend, and expands nationwide through April — refers to the menacing, mysterious hotel room at the center of Stanley Kubrick’s The Shining, a film that has inspired perhaps more deep analysis, explication, and theorizing than pretty much any other major feature film of the last 40 years. In the doc, director Rodney Ascher and producer Tim Kirk interview five people who have dedicated a rather alarming amount of their lives to attempting to understand the multiple meanings packed inside Kubrick’s adaptation of the Stephen King best-seller. Overtop a hypnotic collage of imagery, these five people — veteran journalist Bill Blakemore, history professor Geoffrey Cocks, playwright Juli Kearns, musician John Fell Ryan, and filmmaker Jay Weidner — unspool their always fascinating theories, ranging from keen observations about Kubrick’s disorientating filmmaking to, say, how the film is really Kubrick confessing his involvement in faking the footage of the Apollo moon landing.