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Re:Ask HN: Why is vertical video so popular? by naniwaduni on Sunday June 05, 2022 @07:24PM (#31635766)
> Landscape has a super old history, but it made the most sense where it originated, which was the stage, with curtains, for live theater.

Also, eyes.

Re:Ask HN: Why is vertical video so popular? by bckygldstn on Sunday June 05, 2022 @08:00PM (#31635984)
In case anyone else was wondering the aspect ratio of eyes: it's about 4:3 to 16:9 [0].

[0] https://biology.stackexchange.com/questions/5128/preferred-a...