I am Not Living in a Computer Simulation, and Neither Are You

BY PETER KASSAN

The notion that we’re all just computer simulations living in a simulated universe—once the stuff of late-night college dormitory bull sessions—has now resurfaced, having been espoused by (among other eminences) a world-famous astrophysicist and an Internet entrepreneur billionaire.

The notion is the latest manifestation of what was perhaps first contemplated (and then, at least to his own satisfaction, disproved) by Descartes, whose cogito, ergo sum—I think, therefore I am—was the first step in an attempt to figure out what can be reliably known, although he considered not a computer program creating the illusion of his body and his world, but an evil demon. The idea is a close cousin of the philosophers’ thought experiment (or parlor trick) known as “brain-in-a-vat,” which is said to have inspired the Matrix movies. Notice, though, that brain-in-a-vat requires a real brain in a real vat and the Matrix movies had real brains in real people plugged into their simulated world. The proposition that we’re all just computer simulations in a simulated universe eliminates the vat, the brain, the people, and the world. It can also be seen as the nerd’s version of the notion that we’re all simply dreams in the mind of God—perhaps the central creed of a Church of Computer Science.

The computer simulation argument proceeds along these lines:

• The universe contains a vast number of stars.
• Some of these stars have planets.
• Some of these planets must be like Earth.
• Since intelligent life arose and eventually invented computers on Earth, intelligent life must have arisen and invented computers on some of these planets.
• It is (or inevitably will be) possible to simulate intelligent life inhabiting a simulated reality on a computer.
• Since it’s possible, it must have been done.
• There must be a vast number of such simulations on a vast number of computers on a vast number of planets.
• Since there’s only one real universe but there’s a vast number of simulations, the probability that you’re living in a simulation approaches one, while the probability that you’re living in the real universe approaches zero.

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