Generalizing simulation realism to these scenarios, we arrive at the no-illusion view of Cartesian scenarios. In these scenarios, things are largely as they seem. Subjects in these situations aren’t deceived; they have largely true beliefs about the world. If the no-illusion view is right, then Cartesian scenarios are no bar to knowing about the external world. If most of our beliefs are correct in a Cartesian scenario, then our inability to rule out that scenario does nothing to cast doubt on our beliefs. Our beliefs are more robust than many Cartesians have thought.
