"Well, yeah. I think I've got a few files on all of the things associated with route triple-six." Dib shrugged, "Personally, I figure it's where Hell and Earth have a very weak barrier. Assuming, of course, Hell is a different dimension, which it is by all accounts." He paused to sip his beer as he thought about how to explain it. "Okay, think of this napkin as reality, and all of the folds as different parts of that reality. Different dimensions. Now, most people are primarily concerned with this layer, here, the one in the middle, because that's the part of reality we're used to seeing. The human world. Now, there's also a good amount of Hell dimensions, for lack of a better term, and a great deal of more benign dimensions as well. There's dimensions which overlap ours perfectly but are completely their own thing. Like the Shadow dimension, or the fay realm... Hell, there's some extraterrestrials that are extradimensional. And sometimes, the dimensional layers aren't as thick in some places. Get it?"