There is an old story in the worlds of physics and metaphysics (very different things, by the way) about a confrontation between a scientist and what we will call a layperson. They were debating the origin of the universe, when she proposes that the world sits atop the back of a giant turtle. The scientist asks the obvious question, what is below the turtle? She scoffs, as the the question is ridiculous. The answer, she says, is another turtle. In fact, it's turtles all the way down.