Basically, what I'm thinking is that the universes that we live in are all happening at the same time - even if time has passed completely differently in our worlds, and "time" is really more of a loose definition of the word than it is the actual word itself. Swain called it a patchwork quilt, but I like to think of it more like a tapestry, a sort of Level IV Quantum Multiverse of string that's been wound into different patterns. I don't like the idea of a quilt, because I think all the threads of these universes are connected much more intimately than patches of different fabric, and that's how we end up drawn here, but that's besides the point. A tapestry works a little better with string theory, Anyway.

[ this was a mistake for hunter but also for me as i'm trying to explain at 10 pm. no one criticize me on my scifi. bixing's excited about it and it's correct. sweats. ] - Anyway. Each of these universes are stacked sort of on top of each other, because they're all occurring in the same limited, relative moment, and made of roughly the same string. So, by climbing up the particle string through technology that utilizes particle physics like our transfer portals, instead of transferring across space [ he makes a little gesture with his hands across ], you could transfer across universal "time" [ and makes a vertical gesture with both hands ] instead.

More or less.