[tauntz]

Shower thought: maybe not even an atom but what if our "universe" is a short-lived quark or antiquark? For an observer in the "next level" universe, that quark would exist only for 10^-24 seconds (or whatever the lifetime of quarks is) but for us, that's the whole lifetime of the universe. And it's turtles all the way down indeed, with infinite universes all over the place..

[andoando]

Which would also mean, there is an opposite to our universe that is our anti-quark :]