However, Dr Lincoln Turner of the Monash University School of Physics reveals that Tupac actually appeared via common stage-craft known as 'Pepper's Ghost'.
This illusion involves an image being projected onto a transparent sheet, known as mylar film, using high-definition video projectors, which are reflected off mirrors below the stage. As long as the stage lighting carefully avoided the plastic film, spectators were unaware that they were watching Snoop Dogg and Dr Dre through a screen.
"Tupac had as much depth as any other 2D projection - none - and the illusion only worked because the audience was too far back to see this," said Dr Turner. If you haven't seen Tupac hologram - check it here. And above is a video about the technology behind it. Neat stuff!
source: http://www.youtube.com/watch?v=bKM39MHrWlc&feature=youtu.be
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