[T]echnology-based installations generally include material that is either inherently ephemeral or subject to rapid obsolescence, or both, such as machine-readable media that provides much of the sensory experience of the piece. Examples include videotapes, laser discs, DVDs, color slides, and film and the corresponding playback equipment such as video and disc players, cathode ray tube (CRT) or liquid crystal display (LCD) monitors, amplifiers, speakers, projection screens, computer equipment, and video, slide and film projectors. Real, 2001, p. 212