Describe symbolism in On Writing: A Memoir of the Craft by Stephen King

On Writing: A Memoir of the Craft is a nonfiction book. Symbolism and theme, however, are two things that Stephen King does not believe a writer should consciously add to a novel before the first draft. Stephen King felt that the second draft was the place to find these things and flesh them out, adding more to them when it seemed appropriate. Stephen King changed the initials of his innocent man in the Green Mile when he realized the man was innocent. This caused many of Stephen King's critics to point out the simplistic of this move, but King felt that it just seemed appropriate. King did the same thing in Carrie, emphasizing the symbolism of blood when it showed up at every critical point in the book. Symbolism, King felt, was useful, but not necessary if it did not fit in the story.