Are We Living in a Computer Simulation?
Almost all civilizations at our level of development go extinct before becoming technologically mature enough to run realistic simulations.
Advanced civilizations have almost no interest in running ancestor simulations (simulations of their evolutionary history).
We are almost certainly living in a computer simulation right now.
Adjust your estimates for each factor to see how they affect the probability we're in a simulation.
Substrate Independence: Mental states can be reproduced on different physical substrates. If we can simulate neurons with sufficient fidelity, we can create conscious minds in silicon.
Computational Power: A posthuman civilization would have essentially unlimited computing resources. Running billions of "ancestor simulations" would be trivial.
The Numbers Game: If even a tiny fraction of posthuman civilizations run ancestor simulations, the number of simulated minds vastly exceeds real minds.
Anthropic Reasoning: If most mind-like-ours exist in simulations, then you are probably a simulation. Without special evidence you're "original," you should assume you're typical.
Click universes to expand them. Simulations can run simulations that run simulations...
"Unless we are now living in a simulation, our descendants will almost certainly never run an ancestor-simulation."— Nick Bostrom, "Are You Living in a Computer Simulation?" (2003)
Some argue that consciousness requires specific biological processes that can't be replicated digitally. If "philosophical zombies" are possible—beings that behave like us but lack inner experience—then simulated beings might lack genuine consciousness. Bostrom's argument assumes "substrate independence," which remains controversial in philosophy of mind.
The beings running our simulation would have god-like powers over our universe—able to suspend physics, read minds, or end reality entirely.
Quantum mechanics' strange features (discreteness, observer effects) might reflect computational limitations or optimizations in the simulation.
If simulators lose interest, funding, or power, our entire reality could simply... stop. We'd never know it happened.
Our lives might be research data, entertainment, or training simulations. What does meaning look like if we're someone's experiment?
Our simulators might themselves be simulated. How many layers deep does it go? Is there a "base reality" at all?
If we can't tell the difference, and our experiences are real to us, does being simulated change anything about how we should live?