User blog comment:Xilinoc/Ch. 587 - The Headless Star 6 (for real this time)/@comment-24153155-20140702212248/@comment-24153155-20140702232456

Well, how about the creation of the Vandenreich? I mean, in some sort of way the Quincy found a method to manipulate Reishi in such a way, they could create the space in the shadows. Perhaps that is just what they did: once inside the portal, they manipulated the Bleach space-time (Dangai principle?) and entered the Soul Palace as if opening a door. However, if it was that "simple" why would you wait for the portal to be opened? So far, the only thing I can come up with is that all the different worlds (Human, Seireitei, Soul Society, Hueco Mundo, even the VandenReich) are kind of sealed, they really must be separate dimensions. Like reishi bubbles kinda "floating" in a space (perhaps that's what is meant by "barriers"). But this alone wouldn't be sufficient to explain the relative "ease" of having soul burials or the traveling of Hollows to and from the human world. Perhaps it therefore also is a question of reishi density. The human world is known too have low reishi, but perhaps it's also true that all the other worlds have an average reishi density specific for their world. I guess it might be easy to travel from high to low Reishi. This could mean that the Soul Palace realm itself might be composed of an ultra-high reishi density.