Its field is as much inexperience and lack of experience as experience, absence as much as presence. What one wants to happen is as valid as what does. Fiction's domain, in part, is fantasy's psychic reality, whose underground operations secretly make the world turn. There are things we don't know or will never fully understand. Fiction leaps in to imagine the unimaginable and the underimagined.
Reality wins, apparently, though unless it's represented, whatever it is, it's gone.
But reality, as Timothy Leary quipped, is an opinion. Life's meanings aren't obvious. They beg explanation and interpretation, and are rewarded with speculations and ideas, with fictions in diverse formal displays. Fiction thrives in testing truths and rejecting absolutes. The insoluble, irrational, and unknowable, the normal and the perverse, march through its wide, wild door.