It was a technological feat that made history, wowed audiences and brought a dead rapper back to life. In April 2012 at the Coachella festival in California, Tupac Shakur took to the stage with Snoop Dogg and Dr Dre. He'd been dead for 16 years, killed in a drive-by shooting in Las Vegas.
But this was Tupac the hologram, foul-mouthed and lifelike, performing before a "shocked and then amazed" crowd.
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