I have been playing computer games since the late 1980s. The first computer game I played, Sleuth, was composed of ASCII graphics and text. You were trapped, Agatha Christie style, in a mansion with several other houseguests, one of whom was a killer. It was fun, but you definitely couldn't say that the graphics were immersive or anything approaching virtual reality. In Sleuth, your viewpoint was an overhead view of a very simple floor plan. But since then, computer games have evolved, and...