An anonymous reader sends this quote from Wired: "By harnessing
the power of tiny waves dancing in an electron sea, Japanese
physicists have developed a novel way to project holograms that
don't change color when you move your head. 'In a conventional
hologram, if you change the angle, the color changes,' said
optical physicist Satoshi Kawata of Osaka University in Japan.
'Our hologram shows natural color at any angle you observe.' The
researchers’ machine takes advantage of how beams of light
trigger waves of activity in free electrons, unattached to any
atom, arrayed on a metal surface. Called surface plasmons, these
waves could be used to blast cancer cells and build ultra-fast
computer processors. They also show up in medieval stained glass
windows, where plasmons on flecks of gold suspended in the glass
make the window change color as the sun sets."