All anyone could talk about after this year's Coachella Festival of Music and Arts was Tupac, an artist 16 years in the grave (despite all that buzzy clatter you hear to the contrary). Pac was resurrected by AV Concepts, an audio-visual company based in Tempe and San Diego. They utilized a Musion Eyeliner screen and a 30-by-13-foot project screen to create a 3D, true-to-lifesize projection of Pac in the midst of Dr. Dre and Snoop Dogg's set. It was a stunning, freakishly life-like performance, and while it went down in the history books as one of the most surprising moments in Coachella history (well, the first weekend anyway), it immediately set off rumors of copycat holograms, like Lisa "Left Eye" Lopes with TLC and Freddie Mercury with Queen. AV Concepts, you've worked up some strange feelings for us all (could a Beatles reunion be far behind?), but the trick was a stunning one, indeed.