Perhaps the biggest challenge in making holograms usable on a daily basis -- aside from having to film your subject with a million trillion cameras -- is in getting their refresh rates up to the levels we're used to with "normal" two-dimensional video. We're still a fair way away from those magical 30fps, but the University of Arizona is touting a heretofore unheard of redraw rate of once every two seconds. This is a major advance from their first dynamic holograms demonstrated two years ago, which required minutes to swap over to a new image. The current prototype is built on a 10-inch photorefractive polymer sc
