In their interests regarding sensory deprivation, perception, and human psychology, Robert Irwin and James Turrell invited participants in 1969 to an anechoic chamber at UCLA: a dark, soundproof room where individuals were left completely alone for 10 minutes.

Image: Robert Irwin and James Turrell inside the anechoic chamber at UCLA, 1969, photo by Malcom Lubliner, courtesy of Malcolm Lubliner and Craig Krull Gallery, Santa Monica.