The 2Pac hologram performance at Coachella 2012 was a landmark event that used Pepper’s Ghost technology, a 19th-century optical illusion, to "resurrect" the rapper for a duet with Snoop Dogg on "Hail Mary" and "2 of Amerikaz Most Wanted". The creation by Digital Domain and AV Concepts featured a, high-definition projection onto a Mylar screen, creating a lifelike, 3D effect that significantly impacted the music industry by sparking a 500% increase in 2Pac's album sales. Expand map How That Tupac Hologram At Coachella Worked - NPR