What's the loaf of bread metaphor?
I don't know. Something about imagining the Universe as a slice of bread, with other Universes(slices) "next" to it. But all that does is place the Universes inside a larger 3D construct (the loaf of bread), and fails to explain where the loaf resides. Infinity is the ultimate wig-flipper. No matter how far out you go, can't you go a little farther? No matter how big (or small) something is, couldn't it be just a bit bigger (or smaller)? My dad (a physicist) taught me infinity when I was a young boy. He had me stand a few feet from the wall, told me to go half the distance to the wall, and then do it again, and again, halving the distance to the wall, and to tell him when I got there.