by Tim Sommers

“Suddenly he woke up and there he was, solid and unmistakable Zhuang Zhou. But he didn’t know if he was Zhuang Zhou who had dreamt he was a butterfly, or a butterfly dreaming that he was Zhuang Zhou.” — Zhuangzi (translation by Burton Watson)
“We are almost certainly living in a computer simulation.” – Nick Bostrom*
Is the hypothesis that we live in a computer simulation an improvement, in some way, on the classic skeptical argument that life is but a dream? The dream argument seems to show that life could be a dream. Some claim that the simulation argument shows that not only is it possible that we live in a computer simulation, but that we almost certainly do live in a simulation.
I’ll argue that the simulation argument does not make it any more likely than the dream argument does that this is not reality. Furthermore, the simulation argument might even be worse (as a skeptical argument) in one way. If I am dreaming, there is not just another world, but, in some sense, another me, out there beyond the dream. But if I am a being that only exists in a simulation, it follows that there is no other me out there – and challenges the very idea that this scenario is really “skeptical,” in the same way, as the dream argument.
From Zhuangzi to Descartes to The Matrix, people have worried and wondered over global epistemological skeptical scenarios like these. Let’s call them GESSes.
They are global because they cover all knowledge from our senses, they are epistemological because they raise the question of what we can know, skeptical because they answer, ‘we can’t know anything,’ and scenarios in the sense that they offer a story about why our senses systemically fail to make contact with reality.
So, how do you know whether we are currently being deceived about everything around us by an evil demon or dreaming it all, as Descartes says, or if we live in some kind of simulation? Read more »