When something works well, you can feel it; there is a sense of rightness to it. We call that rightness beauty, and it ought to be the single most important component of design. This recognition is at the heart of David Gelernter's wittily argued essay, Machine Beauty, which defines beauty as an inspired mating of simplicity and power. You can see it in a Bauhaus chair, the Hoover Dam, or an Emerson radio circa 1930. In contrast, too many contemporary technologists run out of ideas and resort to gimmicks and features; they are rarely capable of real, structural ingenuity. Nowhere is this more evident than in the world of computers. You don't have to look far to see how oblivious most computer technologists are to the idea of beauty. Just look at how ugly your computer cabinet is, how unwieldy and out of sync if feels with the manner and speed with which you process thought. The best designers, however, are obsessed with beauty. Both hardware and software should afford us the greatest opportunity to achieve deep beauty, the kind of beauty that happens when many types of loveliness reinforce one another, when design expresses an underlying technology, a machine logic. Program software ought to be transparent: it should engage what Gelernter calls "a thought-amplifying feedback loop," a creative symbiosis with its user. These principles, beautiful in themselves, will set the stage for the next technological revolution, in which the pursuit of elegance will lead to extraordinary innovations

Technology doesn't flow smoothly; it's the big surprises that matter, and Yale computer expert David Gelernter sees one such giant leap right on the horizon. Today's small scale software programs are about to be joined by vast public software works that will revolutionize computing and transform society as a whole. One such vast program is the "Mirror World." Imagine looking at your computer screen and seeing reality--an image of your city, for instance, complete with moving traffic patterns, or a picture that sketches the state of an entire far-flung corporation at this second. These representations are called Mirror Worlds, and according to Gelernter they will soon be available to everyone. Mirror Worlds are high-tech voodoo dolls: by interacting with the images, you interact with reality. Indeed, Mirror Worlds will revolutionize the use of computers, transforming them from (mere) handy tools to crystal balls which will allow us to see the world more vividly and see into it more deeply. Reality will be replaced gradually, piece-by-piece, by a software imitation; we will live inside the imitation; and the surprising thing is--this will be a great humanistic advance. We gain control over our world, plus a huge new measure of insight and vision. 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 pajamas. A hospital administrator might wander through an entire medical complex via a desktop computer. Any citizen might explore the performance of the local schools, chat electronically with teachers and other Mirror World visitors, plant software agents to report back on interesting topics; decide to run for the local school board, hire a campaign manager, and conduct the better part of the campaign itself--all by interacting with the Mirror World. Gelernter doesn't 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. We learn about "disembodied machines," "trellises," "ensembles," and other computer components which sound obscure, but which Gelernter explains using familiar metaphors and terms. (He tells us that a Mirror World is a microcosm just like a Japanese garden or a Gothic cathedral, and that a computer program is translated by the computer in the same way a symphony is translated by a violinist into music.) 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.

'A brand name in computer science' (New York Times), David Gelertner has revolutionised computing with his work in the field of parallel processing. In this provocative new book, he urges the importance of a criterion of beauty in valuing the best of computers and software alike, and deplores the effects of a two cultures approach that sees beauty and computing as incompatible concepts. Technically accessible, wittily argued and stimulatingly visionary, Gelertner's book provides a manifesto for all future computer users, programmers, designers and manufacturers to follow into the next century.