ABSTRACT
The number of imaginary worlds that could potentially be created is nearly infinite. Given how many imagined worlds have gone unrecorded, being either orally transmitted or private to an individual in the first place, they are also uncountable. Secondary worlds may be placed on a spectrum of "secondariness", depending on how detached they are from the Primary World, how different their world defaults are, and how thoroughly their details have been developed. Each imaginary world is itself a locus but is also constructed from smaller, discrete loci, defined by their own borders and boundaries. For most of recorded literary history, the majority of imaginary worlds have been connected to the Primary World. While every secondary world is separated from the Primary World by some form of border, any secondary world of sufficient size will contain its own internal borders and boundaries. Secondary world borders are not limited to separating mundane realms.
