Ethan Hawke says making a good horror movie is all in the "math"
The actor plays a malevolent child kidnapper called The Grabber in the upcoming film The Black Phone

What’s in a scary movie? Well, according to Ethan Hawke, a whole lot of math. The veteran actor, who cut his teeth in the horror world in films like Sinister and Daybreakers, said there’s a certain divine geometry in making truly bone-chilling cinema.
“Making a good horror film is a lot like solving a geometry problem. There’s a math to a building. It has to be simple enough, complicated enough,” the actor tells /Film in a recent interview. “People write books about Hitchcock and the timing and the way the cuts work. There’s just a math to it.”
Hawke is putting his theory to the test in his new horror film The Black Phone. Again teaming up with Sinister director Scott Derrickson, Hawke plays a sadistic masked villain known as The Grabber. The Grabber lives to kidnap and terrorize children in his basement bunker—and on the side, (because everyone needs a passion project!) work as a part-time magician.
In Sinister, Hawke’s character Ellison Oswalt was the unassuming victim to the film’s grand menace (although unassuming may be too generous a word, given Ellison literally moved his family into a haunted murder house for a book deal.) But in The Black Phone, Hawke is the one doing all the menacing, as the trailer for the film reflects.