Let's say there are four spacial dimensions. We, our reality, and our universe exist in 3d space. Let's also say that we are located at 0 on the w axis; if we were to shift along the w axis, we would still exist, but we would vanish from our original reality and thus our original universe. Each shift along the w axis gives a different 3d shape, so what if each shift along the w axis gives a different universe? What if the multiverse was a 4 dimensional shape, and every universe is just a 3d cross-section of the multiverse?
makes sense