Flying cars, transparent cloaks, technology which can read minds and games played by brain waves - the stuff of fiction, surely? Not so, these seemingly far-fetched inventions - and more - are now reality.
For a vision of what the future holds, thousands of nay-sayers and believers alike have got an up close and personal glimpse at NextFest, an expo in San Francisco organised by the technology magazine, Wired.
"This is a city that is always looking at what is next," says editor-in-chief Chris Anderson. "We have brought the most innovative minds and extraordinary technologies from around the world and here is what's next. These are the things that will change the way we live and work and play in the future."
The 110 exhibitors were chosen from 2,500 research and development projects underway at universities and corporations worldwide.
Some showcase new thinking; others take an existing concept and turn it on its head, such as Brainball, a computer game in which being ferociously competitive is not on.
Co-inventor Thomas Broome, of Sweden's Interactive Institute, says it's an anti-game.
"The more relaxed you are, the more you can get unconnected to your state of winning and wanting that you actually win this game. Brainball measures your alpha waves and the person who is the most relaxed can push the ball to the other side and win."
Among the game's fans are the musician Brian Eno, yoga gurus and children with attention deficit disorders.
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