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Mathematicians Design Invisible Tunnel
New calculations show how to make an electromagnetic "wormhole" — a tube that is invisible from the sides but allows light to shine down the center. The practical applications are a ways off, as even the design of a spherical invisibility cloak has not advanced beyond working (in theory) for a single wavelength of visible light.
The one application that struck me is the holographic implications. If you can get light to move to a precise spot in mid-air through an invisible tunnel, you can make objects appear anywhere. No smoke or mirrors required.