Ok, so this is cheating – it wasn’t CGI. Still though, for 1939 standards, it’s pretty insane.

According to the novel, Scarlett O’Hara has green eyes, but the actress’ eyes were blue. Since contact lens tech was relatively new, there needed to be another way to change the eye colour.

So someone literally had to colour correct every frame of the picture with chemicals and paint to ensure the vivid green shone through. In. Every. Scene.