Lights Out (review), which came out earlier this year, was a very well received supernatural horror film that took the original short and turned it into something far more intelligent and witty. In fact, many people who saw it were astonished to find a film that had a lot of depth and emotion, thinking that it was just going to be another scarefest. It’s the kind of horror movie that gives credibility to our genre while still being a damn good time.

Director David F. Sandberg has uploaded a video where he explains a lot of the work that he himself put into the VFX of the film, much of it stuff that’s so subtle that you’d be hard-pressed to even realize that your eyes were being deceived. For aspiring filmmakers, it’s a really interesting video that delves into aspects of film creation that some people might not think about.

Be warned that there are spoilers in this video, so watch it at your own risk if you haven’t seen the movie.