Post Tenebras Lux, the newest film from Carlos Reygadas, is the director’s best and most provocative film to date. It also may be the most opaque venture he’s made since Maxhumain, his short from 1999. Both films derive their gravitas from a deliberately personal vision—each only fully understood by their creator—but Maxhumain remains much more immediate. It concerns a man going through a severe crisis on a beach— apparently about to take his own life—and having a flashback to a conversation with his mother about suicide from his childhood. It can all be a bit rough around the edges, and one wishes that Reygadas would have developed this idea even further. Now the film plays a bit like a puzzling teaser—one that shows glimpses of the far riper talent to come.