Are we living in a simulation? What the argument actually claims
In 2003 the philosopher Nick Bostrom published a short paper in Philosophical Quarterly called “Are You Living in a Computer Simulation?” It didn’t claim we are. It claimed that one of three things has to be true: almost no civilizations reach the point of running detailed simulations of their ancestors, almost none that could would bother, or we’re very likely inside one.
That’s a clever piece of reasoning, and it’s also where most online coverage stops thinking. The argument rests on assumptions you can question: that consciousness can run on hardware, that future civilizations would spend their computing that way, that we can reason about probabilities across worlds we’ve never seen. None of those are settled.
This section treats simulation theory as philosophy with a long family tree. Zhuangzi dreamed he was a butterfly. Descartes imagined a demon feeding him false impressions. The modern version swaps the demon for a server rack. We look at what the argument does well, where physicists and philosophers push back, and why “it can’t be tested” is a real problem rather than a fun shrug.
If you came here hoping to be told the world isn’t real, you’re in the wrong place. If you want to know why smart people take the question seriously anyway, start here.
Filed in Simulation Theory
Nothing filed in Simulation Theory yet. The first piece is in edit; until then, the reading list below is what we’re reading.
Reading list from Aeon
Before you go further
What should I know before getting into simulation theory?
Simulation theory is a philosophical argument, not a proven scientific finding. Start with Nick Bostrom’s 2003 paper, which argues that one of three possibilities must be true rather than claiming we live in a simulation. Then read the critics. Being able to explain why the idea is hard to test is a better sign of understanding than being convinced by it.
How much does simulation theory cost in United States, Canada, United Kingdom, Australia, Europe, global English-speaking technology and philosophy audiences?
Nothing. Simulation theory is an idea, and the core papers, lectures and debates are free to read online wherever you live. You only spend money if you choose to, on books, a university course or a VR headset to experience simulated environments yourself. Be wary of anyone charging for “proof” or secret knowledge about it.