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A new technology is able to use ordinary light to create holographic images, opening to door to 3D displays without the need for special screens or glasses.
The new technology will use the diffraction of free electrons on thin metal films. When the electrons are excited by incoming protons, they begin to emit colored light at a specific wavelength. These excited electrons will emit a different color of light depending upon the angle of the incoming proton, and bouncing this light off an etched surface will result in a hologram that shows the same colors from any angle.
The new technology is not too difficult, and could be used to create 3D still and moving images that don't require glasses.