William Kotzwinkle, whose book "E.T." inspired one of the most popular movies of all time, says he always identified with his space creature. "I know what it's like to be a little geek from the start," Kotzwinkle said at a writing workshop at the University of Dayton last week. "I see myself as the father of many parts of E.T." Kotzwinkle, 50, also told the aspiring writers that the child is the mother of imagination. "Don't grow up," he said. "You've got to keep your childhood alive. You can't be childish, you must be childlike. Treat the imagination as your religion, as a separate or free entity different from your ego. If you can see the imagination as a fabric, containing people and places that you never met or never were, then you're on your way."