Inception director Christopher Nolan's next movie, Tenet, is coming to theatres--yes, theatres--in the US on September 3. Reviews for the film have been generally positive, and even Tom Cruise counts himself as a fan. To help promote the film further, Warner Bros. has released a neat behind-the-scenes video featuring Nolan, the cast, and the producers who talk about what a mammoth undertaking it was to make the big-budget blockbuster.

In the video, Nolan explains the origins of the project. "Tenet is an espionage story; it's a classic spy story. I grew up loving spy movies," he said. "But to make it [appeal to] today's audiences ... I wanted it to have bigger possibilities."

He's talking about Tenet's take on time-travel, known as "inversion." The idea here, which some scientists support, is that the entropy of an object or a person can be reversed. In essence, the people and objects in Tenet are moving backward while others are moving forward in time.