The Reality Stratum Theory was a astronomical theory that dictated Reality, Anti-Reality, and Postmortal Reality being points on a three dimensional number plane. The original philosopher of this idea was a Zenolian, though his name remains unknown. The origin spot on the number plane is, of course, Reality at 0,0,0. One point up on the Z-intercept is where Postmortal Reality is located, and one negative point on the same line is Anti-Reality. Them being at different heights infers that they are layers upon one another. The theory also seems to explain how pocket dimensions can exist, as they are in the physical grid quadrants, but are just at different Z-intercepts.