I'd say it has more to do with human vision which cover a wider horizontal angle than vertical.
The medium (film) maybe adapted to how we see. Nowadays it might be adapting to how we hold the thing we see through.
The medium (film) maybe adapted to how we see. Nowadays it might be adapting to how we hold the thing we see through.
Aspect ratios were surprisingly all over the place in early film. Now I'm wondering what parts of aspect ratios were driven by the actual physical characteristics of film.
Vertical is simply a thing, because phones are generally used in portrait mode.
The traditional aspect ratios were created to suit human vision.