I’ve found that the best results come when you find a comfortable middle ground and then let the needs of the story determine how deeply you penetrate the viewpoint character’s mind. In some scenes you’ll get “hot” and penetrate deeply, letting the audience feel that they’ve become the viewpoint character. In some scenes you’ll “cool off,” let the audience retreat from the character and watch things passively for a while. In between, you’ll use light penetration to keep us aware of the constant possibility of seeing into the viewpoint character’s thoughts, so we aren’t startled when things get
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