The multiverse - A pretend model

Given the hypothetical notion of a multiverse, a question arises of that of is each multiverse different and possessing different characteristics? If so, this is what I imagine the multiverse to be, though of course we can never know, because the whole concept of a mirror universe is that there are bubble universes floating within a mirror box, so how could we ever visit another multiverse. And so what do you get with a completely mirrored box? Reflections, everywhere. It's all coordinate smoke and mirrors