For centuries philosophers have disputed whether the sky really is blue or whether this "blueness" is only in the eye of the beholder. But perhaps there is a better way to think about perception . . .In this controversial and challenging book, Jamie Carnie introduces a radical new perspective on the way our senses operate, setting out to save our instinctive belief that colors, sounds, flavors, textures, and scents are features of the "real" world and not just mental constructs that disappear the moment we look away. A minimal model of the mind as a virtual machine helps us formulate Carnie's universe.