I was browsing the "Mapping Infinity" section of Mimir.net and reading about all the different theories about the shape and nature of the multiverse.
After a while, I thought that I would give the whole "explaining the universe" thing a try myself.
http://www.deviantart.com/view/6997738/
This is a two dementional version of what was originally a three dementional image in my head of an object that's most likely four dementions or more. This is actually a quasi-hybrid of Na'Tak Karari's Planar Pillar theory and Magnum Opus's Great Great Ring theory with a little Spelljamming lore thrown into the mix for flavor.
I also took the liberty of postulating a few theories of my own, like the "Convergence Point" (A infinately small point of spacetime that exists in the Inner, Outer and Material planes simeltaniously. A place where physicial material, ideas and all things inbetween meet, mix and is expelled into it's respective planes). The idea that the spire in the Outlands is actually hollow. It's not really a tower, but an infinately deep pit in the shadow plane (I'm adopting Lung Tzu's theory that the shadow plane is an Inner Plane, not a psudo-plane.) that looks like it's been turned inside-out when perceived by those living in the Outer Planes.
I have a few other ideas, but I'll get into them later. Any thoughts so far?
That looks a little difficult to understand, I'm sorry to say. Where exactly are the Outer and Inner planes supposed to be? Is the entire cosmos a torus like sigil or is that a flat plane?