When on the set of a film, you have to play natural for entire scenes in a very unnatural environment. You have to express emotions and interact with other actors and also use your voice.
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This friend of mine said he was surprised to find that - I don't think it's quite a majority - a bigger percentage of actors are introverts than extroverts. It was a big surprise to him. Now, I know me, and I'll do anything if I'm playing a character. Or anything that's true to the character, anyway. But in real life I'm a little more withdrawn.