A Mind-Bending Meditation On The Transcendent Power Of Digital Computation.

He elaborated: "Every it -- every particle, every field of force, even the space-time continuum itself -- derives its function, its meaning, its very existence entirely from binary choices, bits. What we call reality arises in the last analysis from the posing of yes/no questions."

If this sounds like a simulation of physics, then you understand perfectly, because in a world made up of bits, physics is exactly the same as a simulation of physics. There's no difference in kind, just in degree of exactness. In a universe run on bits, everything is a simulation.

An ultimate simulation needs an ultimate computer, and the new science of digitalism says that the universe itself is the ultimate computer -- actually the only computer.
Wired