Shakespeare used the soliloquy to give oral expression to thoughts. Since then the soliloquy had become obsolete. But it was a wonderful device: so I… - Rouben Mamoulian

[Mamoulian] "[T]he majority of the films in the future will be done in color. Perhaps not immediately. Perhaps it will take three years or five years. But there must be progress and development in the cinema. Color will enrich it. It is part of that progress.

As soon as you use an element on the screen it becomes subject to dramatic laws. This is as true of colour as of everything else. So I wanted to shoot everything from the start. I took four or five weeks to prepare my plans. My idea was to build up the colour dramatically. I wanted to start with black, white, grey; then ooze into colour. And I wanted the dramatic climax of the film to coincide with the colour climax, which would be predominantly red, because that is the nature of red.

Garbo asked me: "What do I play in this scene?" Remember she is standing there for 150 feet of film – 90 feet of them in close-up. I said: "Have you heard of tabula rasa? I want your face to be a blank sheet of paper. I want the writing to be done by every member of the audience. I'd like it if you could avoid even blinking your eyes, so that you're nothing but a beautiful mask." So in fact there is nothing on her face: but everyone who has seen the film will tell you what she is thinking and feeling. And always it's something different. Each one writes his own ending to the film; and it's interesting that this is the scene everyone remembers most clearly.