In 2003, Swedish philosopher Nick Bostrom published a paper titled "Are You Living in a Computer Simulation?" which revolutionized modern metaphysics and the philosophy of technology. Bostrom did not simply assert that we live in a virtual reality; instead, he constructed a rigorous probabilistic argument known as the Simulation Trilemma. The trilemma proves that if we assume certain technological trajectories are possible, we must accept one of three mutually exclusive propositions.
The Three Propositions of the Trilemma
Bostrom argues that any technologically developing civilization must eventually arrive at one of the following three outcomes:
- Proposition 1: The extinction rate of human-level civilizations is very close to one. This means that almost all civilizations at our current stage of development go extinct before reaching a "posthuman" stage—a state where they possess astronomical amounts of computing power.
- Proposition 2: The fraction of posthuman civilizations interested in running ancestor simulations is very close to zero. Even if civilizations survive to become posthuman, they choose not to run simulations of their evolutionary ancestors. This could be due to ethical prohibitions, lack of interest, or strict laws.
- Proposition 3: The fraction of all people with our kind of experiences who are living in a simulation is very close to one. If both Proposition 1 and Proposition 2 are false, then a vast number of posthuman civilizations will run billions of highly detailed ancestor simulations. Because the number of simulated minds would vastly outnumber biological minds, the probability that we are among the biological minority is virtually zero.
The Logic Behind the Probability
The strength of Bostrom's argument lies in its mathematical structure. If a single posthuman civilization decided to run ancestor simulations, they could easily run millions or billions of them using a fraction of their computational resources. Each of these simulations would contain billions of virtual people who possess conscious experiences identical to our own.
If this is the case, then for every one biological human living in the real, "prime" reality, there would be billions of simulated humans living in virtual realities. If you do not know whether you are biological or simulated, basic probability dictates that you should assume you are one of the simulated ones, as they make up 99.999% of the population. Therefore, if we believe that humanity will survive to the future and continue to run virtual worlds, we must conclude that we are currently living in one.
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Join NowImplications of the Trilemma
The Simulation Trilemma shifts the question of virtual reality from science fiction to empirical probability. It forces us to look at our own technological progress. If we eventually create conscious artificial intelligences and run our own ancestor simulations, we will have empirically proven that Proposition 1 and Proposition 2 are false. By doing so, we would provide near-certain proof that we ourselves are living in a simulation run by a higher civilization.