We may not often consider how the video we transport and display will contribute to, if not actually define, our environment. What if video became a primary means for facilitating experiences? Here, Michael McGandy writes about Bill Viola, who is among the first and certainly among the leading video artists. Viola's work?its content, vibrancy, and scale?creates whole environments and rich user experiences with a sophisticated technology that?s nevertheless well hidden. His work represents the perfect marriage of art and cutting-edge technology to facilitate the exploration of innermost reality.