Last Sunday, attendees of the 2012 Coachella music festival were shocked when infamous rapper, Tupac Shakur, took the stage in the form of a hologram to give a live performance - quite a feat, considering the man has been dead for over 15 years. Fans gawked and cheered as the incredibly realistic-looking "hologram" moved around the stage, called out to the audience, and even performed a song alongside his old friend, Snoop Dogg, before disappearing in a burst of light.
