A large whirlpool forms inside a 70-foot diameter acrylic bowl and falls 2 stories to a pool below. The artwork, a collaboration with architect Moshe Safdie, functions as both a skylight and a rain collector. The rain water is recycled back to the whirlpool and also fills a canal that runs through the atrium. The pumps that direct water into the bowl are turned on and off a few times an hour so the whirlpool is always changing in shape and intensity. At peak flow rates there are 8000 gallons per...