4:3, 16×9, 2.35:1, 1.85:1. Talking about aspect ratios can look like a math problem. Actually, the numbers – which represent different ratios between width and length, have a deep history in the development of film as a medium. Different cameras, lenses, screens, and marketing ideas have all contributed to the changes. A new video by FilmmakerIQ, called The Changing Shape of Cinema: The History of Aspect Ratio, explains that history.