The facade of a cooling tower was covered with 10,000 hinged metal channels that fill with water and tip either left or right. When they tip they spill water into the center of the channel below which then tips either left or right. The result is a complex and unpredictable dance of water and metal where each element alters the behavior of the elements surrounding it. The artwork, a collaboration with architect Moshe Safdie, also aids the functioning of the cooling tower by mixing water with air and cooling the water which gets recycled back into the system. Completed in 2011.