One of the first things people discovered when modern computing became a reality is that it’s relatively easy to simulate laws of physics, representing aspects of the real world. This theoretically enables an approach to simulation that builds an entire universe from basic building blocks. A quark could be a tiny bit of fundamental matter (whatever that might be), but it could just as easily be a rule programmed into a computer—or perhaps even a coherent thought in the mind of an all-powerful intellect.