This is a brief essay about a long or perhaps interminable subject, about what I am (for the moment) calling the genre of the unfinishable work, as distinct from works that are unfinished or open-ended—the work whose themes and style involve what comes last and then what comes after that, if there is anything after that. I thought at first there might be too few of these works to form a genre. Now I am inclined to think there may be too many, but the shift or increase does give us a contrasting term and may help us consider more closely the possibility that lies between insufficiency and excess.