[The] basic premises of Romanticism and Naturalism (the volition or
anti-volition premise) affect all the other aspects of a literary work, such as
the choice of theme and the quality of the style, but it is the nature of the
story structure—the attribute of plot or plotlessness—that
represents the most important difference between them and serves as the main
distinguishing characteristic for classifying a given work in one category or
the other.