Two questions I can’t really answer about fiction are (1) where it comes from, and (2) why we need it. But that we do create it and also crave it is beyond dispute. There is a tendency, considered highly rational, to reason from a narrow set of interests, say survival and procreation, which are supposed to govern our lives, and then to treat everything that does not fit this model as anomalous clutter, extraneous to what we are and probably best done without. But all we really know about what we are is what we do. There is a tendency to fit a tight and awkward carapace of definition over humankind, and to try to trim the living creature to fit the dead shell.