The holographic people we've seen are based off of an illusion called "Pepper's Ghost," developed by Henry Dircks and John Pepper in 1863. Its work dates back to Madonna performing with Gorillaz at the Grammy awards in 2006, and Al Gore speaking in Tokyo at 2007's Live Earth concert. Why it seems that no one much cared about any of this before the dead were involved, though, isn't exactly clear - especially when one of the key companies behind the recent craze, Dimensional Studios, is responsible for basically all of the performances you're familiar with. What we're seeing now is more of a parlor trick involving some figurative smoke and literal mirrors. Holograms use an array of lights to project a 3D image that's viewable from all sides. Before we get into what this spate of digital resurrections is, let's start with what this technique isn't: an honest-to-goodness hologram, the likes of Princess Leia pleading for Obi-Wan's help.
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