Rafael Lozano-Hemmer is a Mexican artist who makes interactive light installations. Here are 2 of his works:
Homographies is an interactive installation featuring 144 robotic fluorescent light fixtures controlled by 7 computerized surveillance systems. As people walk under the piece, the light tubes rotate to create labyrinthine patterns of light that are “paths” or “corridors” between them.
Pulse Room, a sensor records the pulse of the public and converts it into light flashes shown by incandescent light bulbs. At any given time the room shows the heartbeat of the 100 most recent participants.