A leading philosopher takes a mind-bending journey through virtual worlds, illuminating the nature of reality and our place within it.

Is this the real life? --What is the simulation hypothesis? -- Do we know things? -- Can we prove there is an external world? -- Is it likely that we're in a simulation? -- What is reality? -- Is God a hacker in the next universe up? -- Is the universe made of information? -- Did simulation create its from bits? -- Do virtual reality headsets create reality? -- Are virtual reality devices illusion machines? -- Does augmented reality lead to alternative facts? -- Can we avoid being deceived by deepfakes? -- How do mind and body interact in a virtual world? -- Can there be consciousness in a digital world? -- Does augmented reality extend the mind? -- Can you lead a good life in a virtual world? -- Do simulated lives matter? -- How should we build a virtual society? -- Foundations. What do our words mean in virtual worlds? -- Do dust clouds run computer programs? -- Is reality a mathematical structure? -- Have we fallen from the Garden of Eden? -- Are we Boltzmann brains in a dream world?