This theory is based on something suggested by Neshomeh on the wiki's Multiverse Theory talk page. I've expanded it slightly, given it a diagram and a name, and plan to include it on the revised version of that page. But for your entertainment, I figured I'd also put it up here.
(Note: for the wiki article, a 3-D model of time is used: 'depth-time' is your past-future line, while 'height' and 'width-time' are defined differently depending on the theory)
The
Nested Elongated Superstring Hypothesis visualises each canon universe as plane in two temporal dimensions. Its ‘depth-time’ axis corresponds to its past and future, while its ‘width-time’, as in Temporal Axis Theory, is probability. Alternate universes of a canon are placed along the width-time axis, while the various canon universes are viewed as being ‘stacked’ in height-time.
The key difference from Temporal Axis Theory is that the PPC and its alternates are seen as identical planes, but rotated to intersect the ‘canon’ planes. The height-time axis of the canon ‘stack’ corresponds to the depth-time axis of a PPC-type universe; in other words, accessing a different canon is simply a matter of travelling through time. This is a simple task in PPC HQ, though it does explain the generally difficult nature of timekeeping in the PPC.
HQ’s width-time axis - the probability regularly manipulated by portals - corresponds directly to that of the canon universes: probability manipulation allows direct access to fanfics. Alternate PPCs - ‘alternate multiverses’ - are separated along their own height-time axes, which PPC technology is not able to transit through.
The PPC height-time axis corresponds to the canonical depth-time axis. A semi-cyclic temporal model is utilised by NESH, in which canon worlds reach their end and repeat, but with differences. These differences explain the ‘mirror’ nature of the canons of the Mirror Multiverse, as well as the near-impossibility of travelling to alternate multiverses: to reach them would require agents to pass through the end of one universe and the beginning of another. The formation of Bridges is seen as an act of shortening the length of the temporal loop, as was observed in the ‘Suedom’ incident.

Discuss?
hS