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"All currently available true 3-D displays... are far too dim, require too much space and power, and have inadequate user interfaces for interacting with 3-D imagery," the Air Force sighs. "Stereoscopic approaches... require special headgear, which causes discomfort and nausea in many users, diminishes luminance for all viewers, and precludes accessibility for multiple and/or unexpected viewers. Autostereoscopic (no eyewear) 3-D systems" are also too slow, too dim, or "cause nausea in most users."
A couple of years ago, you might have been tempted to think these Air Force folks had watched the Star Wars "you're my only hope" scene a few too many times. But now, "holographic motion, as featured in Star Wars... may be just a few years away from reality," according to IEEE Spectrum.