"It's an essay that Sigmund Freud wrote about E.T.A. Hoffman's short story called "The Sandman" where someone mistakes an inanimate object for a living, breathing human being. And one of the things that Sigmund Freud really felt was that in modern life people assign qualities to objects around them that may not exist there whatsoever."

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You must create the character's internal life. What do I mean by internal life? I mean the thoughts, feelings, memories, and inner decisions that may not be spoken. When we look into the eyes of actors giving fully realized performances, we can see them thinking. We're interested in what they're experiencing that may never be spoken, that quality of nonverbal expression - which is as much a part of the characters as breathing and as real as what they say and do. This is their internal life. It helps us believe in the characters and care about them.

— Larry Moss