Virtual reality is real reality! In his highly original book, internationally renowned philosopher David J. Chalmers provides a stunning analysis of our technological future. He argues that virtual worlds are not second-class worlds and that we can lead meaningful lives in virtual reality – indeed, we may already be in a simulation. Along the way, Chalmers takes us on an engaging tour through the great ideas of philosophy and science. He uses virtual reality technology to open new perspectives on well-known philosophical questions. How do we know there is an external world? Is there a God? What is the nature of reality? What is the relationship between mind and body? How can we lead a good life? All these questions are illuminated in a new light through Chalmers' analysis, providing fruitful insights. Filled with wonderfully witty illustrations that make abstract philosophical themes tangible, Reality+ is a foundational work that will shape the discussion of philosophy, science, and technology in the years to come.