In this fascinating book - part speculation, part explanation, Gelernter takes us on a tour of the computer technology of the near future. Mirror Worlds, he contends, will allow us to explore the world in unprecedented depth and detail without ever changing out of our pyjamas! Gelernter does much more than just speculate about how this amazing new software will be used - he shows us how it will be made, explaining carefully and in detail how to build a mirror world using technology already available. Mirror Worlds offers a lucid and humanistic account of the coming software revolution, told by a computer scientist at the cutting edge of his field.