The Sound Illusion that Makes Dunkirk So Intense

You've heard the sound many times -it appears to rise, and rise, and rise in tone, but it never reaches a climax, or else takes way longer than you think it should to reach a climax. This is called the Shepard tone. This video from Vox explains how the Shepard tone works, and why it's so effective in creating tension in a movie, like the Hans Zimmer soundtrack for the new Christopher Nolan historical film Dunkirk. (via TYWKIWDBI)