invisible (Page 5)

The mathematicians who first created the invisibility cloak now think that the same technology could be used to create 3D TV.

The secret is a mathematical construct known as “wormholes.” Mathematician Allan Greenleaf says, “You could pass an object into one end [of their wormhole tube], watch it disappear as it traveled the length of the tunnel, and then see it reappear out the other end.” The wormholes themselves would be invisible, but their ends could transmit light carried up from below. It would be as if thousands of pixels were simply floating in the air.

But Greenleaf admits that, even though the mathematics show that it’s possible, a TV set that broadcasts in 3D is a very long way off (so it won’t be available THIS Christmas!)
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Several clothing manufacturers have experimented with acloak ofinvisibility you can wear around, but now researchers thinkthey can use this technology for something much moreimportant: making warplanes and spacecraft invisible. Thetrick: Light scattering. We can see objects becauselight bounces off them, but if this scattering of lightcould be prevented (and if the objects didn’t absorb anylight), they would be invisible.
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Susumu Tachi, who invented a cloak that makes its wearer “invisible,” now plans to develop technology that will allow people to see through walls. He says, “My short term goal would be?to make a room that has no outside windows appear to have a view to the outside, then the wall would appear to be invisible.”

The cloak works by projecting an image onto itself of what is behind the wearer, making him seem invisible. It’s made of a new fabric called retro-reflectum. “This material allows you to see a three-dimensional image,” says Tachi. Aside from startling other pedestrians, the cloak can be used by spies. The invisible walls could be used by pilots to see through the floor of the cockpit to the runway below.
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A Tokyo professor may have been inspired by rumored U.S. invisibility camouflage for fighter jets, which makes the lower surfaces of an airplane project an image of the sky above it, rendering the plane invisible. He’s applied this technique to a coat which, when worn, makes your body seem to disappear. However, the parts not covered by the coat remain visible, so you look like a floating head.

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