How Aspect Ratios Have Changed Over Time Because of Movies.
Here is a great post by Casey Chan, enjoy.
If you haven’t learned anything interesting today, watch this fascinating history lesson on how the aspect ratios we know (16:9, 4:3) became the standard of what we see. For any film geek or ratio nerd, it’s a lovely trip back into time where things can become standard by just doing it for a long time.
Probably the best wrinkle in aspect ratio history is how 16:9 came about: old 4:3 movie theaters birthed 4:3 television sets which stopped people from going to 4:3 movie theaters which made 4:3 movie theaters go widescreen to offer something different at home (which also eventually gave way to widescreen TVs).