Bill Gourgey is a Popular Science contributor and unofficial digital archeologist who enjoys excavating PopSci’s vast archives to update noteworthy stories (yes, merry-go-rounds are noteworthy).
WHEN THE HOLOGRAM of Princess Leia, projected by the little droid R2-D2, appeared in the first Star Wars movie in 1977, the hopes and dreams of 3D-viewing enthusiasts likely soared. Even though the hologram was fictional, it was a glimpse of 3D’s supposed glasses-free future—never mind that the hologram itself was viewable only in 2D .
The effect is reproduced in a theater by slightly offset simultaneous projections. For movies that rely on polarized eyewear, the projected images use polarized light. Light is an electromagnetic wave that travels primarily along two planes—vertical and horizontal. A polarized filter, or lens, blocks one of the planes, or phases. In polarized glasses, one lens blocks the vertical phase, the other the horizontal.
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