Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. This book contains extensive information about virtual reality, which refers to computer-simulated environments that can simulate places in the real world, as well as in imaginary worlds. Most current virtual reality environments are primarily visual experiences. These are displayed either on a computer screen or through special stereoscopic displays, but some simulations include additional sensory information such as sound. Some advanced systems now include tactile information, generally known as force feedback, in medical and gaming applications. Read about the key concepts of virtual reality and its pioneers including Maurice Benayoun, Fred Brooks, Doug Church, and much more. Project Webster represents a new publishing paradigm, allowing disparate content sources to be curated into cohesive, relevant, and informative books. To date, this content has been curated from Wikipedia articles and images under Creative Commons licensing, although as Project Webster continues to increase in scope and dimension, more licensed and public domain content is being added. We believe books such as this represent a new and exciting lexicon in the sharing of human knowledge.