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"What's happening in Coachella is virtually the same thing that was happening in 1862, " Mr. Steinmeyer said.
WSJ: Tupac Shakur 'Hologram,' Seen at Coachella, May Go on Tour
Mr. Steinmeyer used similar technology to create an illusion in which Frank Sinatra appeared at a 2003 concert.
"A piece of glass can be both transparent and reflective at the same time, depending on how it's situated relative to the audience, " said Mr. Steinmeyer, pointing out the secret.
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