[TopQuark]

"IMHO the Principia is a non-orientable manifold."

With boundary?

[RightWhale]

With boundary?

Lacking even a simple thing such as a single center. You can start with any two assertions and derive the rest. Although it is easier with four.

[KayEyeDoubleDee]

RW, do you think it likely that PM is topologically equivalent to the universe itself? Man, screw the turtles, now I'm thinking, it's fractals, old lady, fractals all the way down..