Although Tupac Shakur was shot and killed in 1996, he still managed to take the stage at Coachella to perform as a hologram Dr. Dre and Snoop Dogg. The animated band called the Gorillaz performed live for years as holograms, so this is nothing new (below). The big difference is that Tupac’s hologram was really video of him turned into a hologram, and the Gorillaz was pure animation made into a hologram. Both were very cool. The full Tupac performance is at the bottom.
I’m still waiting for smart phones to have hologram calls before I get one.