““Mark Twain published Adventures of Huckleberry Finn at age forty-nine using a “trial-and-error method,” scholars note, and “discovered his pliable plot as he went along, writing without a definite resolution or plan in mind.” Twain himself commented, “As the short tale grows into the long tale, the original intention (or motif) is apt to get abolished and find itself superseded by a quite different one.””