  The point here is that there are unactualized possibles as exemplified in works of fiction. In other words, a work of fiction represents some way the world could be. (To be precise, works of fiction represent partial ways worlds could be since they do not (and cannot) depict complete or total worlds. For example, was Lincoln shot in the world described by Moby-Dick? We don't know.)  But, insofar as these possibles conflict among themselves, it is clear that not all possibles are compossible. Rather, as we saw above, sets of compossible individuals are Leibniz's possible worlds.  If we add to this picture the idea that each individual has a complete individual concept – that is, a determinate concept – which is sufficient to distinguish it from every other possible world, then we see that possible individuals are tied to determinate possible worlds.