Bill Viola, Tristan’s Ascension (The Sound of a Mountain Under a Waterfall), 2005, Color High-Definition video projection; four channels of sound with subwoofer (4.1), Projected image size. 19 ft x 10 ft 8 in. (5.8 x 3.25 m), 10.16 minutes, Performer John Hay © Kira Perov, courtesy Bill Viola Studio