OOC: The way I see it, the nexus is, like momentos, the Tartarus, and The TV world, connected to the Collective Unconcious and works similer to Castle Oblivion. The locations in Nexus aren't the REAL locations, just copies of the locations created from memories of the real location, by those who know of the location, i.e. Lablanc is created by Boss' cognition and shaped to how he remembers Lablanc, to go to Lablanc you just think "I gonna go to Lablanc!" and no matter which direction you head in you'll find yourself at Lablanc.
Locations only exist when someone is there to observe they exist, i.e. which threads are active at the time, Everytime a new thread is created a new location is created or recalled by those who remember it.
Locations are created by one, and visited by many, when everyone goes away, that location ceases to exist until someone revisits it again.
(Trying to describe it like a mix between the previously mentioned persona dungeons/Castle Oblivion and fit the nature of being a forum into one cohesive idea, What's you guys' opinion of my theory?)