"Let's calibrate," says soft-spoken choreographer Trisha Brown, and the "wired" subset of her nine-member New York-based troupe spills onto the floor of a rehearsal hall at Arizona State University in Tempe. These four dancers each wear 16 "markers" on their heads and upper bodies, silvery-white balls that act as reflectors for 16 infra-red cameras positioned around the stage space, near the ceiling. The cameras send signals 100 times per second to a team at a bank of computers in the back of the... More >>>