| The waves of sparkling
light that whirl around the top of this exhibit reveal the path
of a traveling disturbance. When the motor is turned on, more than
170,000 hanging pins jiggle and jounce. As they bounce the pinheads
act like mirrors, reflecting the nearby colored lights into viewers
eyes. In some places the vibrations build, creating sinuous, rolling
waves. In other places, the pins interact to minimize movement,
creating relaxed areas that are peaceful and calm.