Such a disappearance is a fundamental consequence not of technology but of human psychology. Whenever people learn something sufficiently well, they cease to be aware of it. Thus, Weiser's vision is even broader: as this technology becomes truly embedded in human activity we won't be aware of it at all. As the field of ubiquitous computing has evolved, with computation embedded in walls, clothes, and so forth, the materiality to support it is often physically and intentionally hidden from the user. Indeed, this material disappearance is often considered evidence of good design. The "agent" metaphor, in particular in its early presentations such as the Knowledge Navigator and Starfire, is also another utopian vision. These virtual agents are typically accessible via peripherals such as screens or phones, doing the bidding of those they serve.

Imagine a world governed by smart technologies engineered to achieve three distinct yet interrelated normative ends: optimized transactional efficiency, resource productivity and human happiness. We could have congestion-free roads--no stop and go, no road rage! Instantaneous, personalized entertainment--no need to search or browse! Successful social interactions--no misunderstanding or missed cues! No surprise ailments, no failures, no missed opportunities!

Since the 1960s, politicians and pundits have predicted the imminent arrival of a digital utopia in which robots would do the washing up and we would live in peace and harmony in an electronically connected, global village, thanks to the net. So why are the utopian visions of 40 years ago strangely similar to the ones we hold today? Because business and political leaders have consistently pushed a carefully orchestrated fantasy of the future to distract us from the present, says Richard Barbrook, who explores the subject in Imaginary Futures - From Thinking Machines to the Global Village. Barbrook, a senior lecturer in politics at the University of Westminster, has been researching this topic for more than four years. What he wants is to show how ideology is used to warp time.

People often ask me about the impact of 3D printing on jobs. Will the technology be a job creator or destroyer? The short answer is, it will take more jobs than it makes -- and 3D printing is not alone. Technology will eventually make work obsolete. Our big problems are going to be figuring out how to survive the transition, then figuring out what to do with all that free time. About 10 years ago, inventor, futurist and now Director of Engineering at Google Ray Kurzweil famously embraced the concept of "the singularity" -- that moment in time when machine intelligence surpasses our own. Kurzweil predicted the singularity would occur by 2045, and man and machine would become inseparable.