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The device, which appeared at the Museum of Modern Art in New York last year, is called AMOEBA (Advanced Multiple Organized Experimental Basin). It's a cylindrical tub about 12 inches deep and just over five feet in diameter. Fitted along the pool's rim are 50 trigger-type units equipped with plungers that agitate the water's surface. Programmed in unison, they can create almost any configuration of ocean wave. An enterprising student at the lab discovered that when the correct wave frequencies intersect, the water will support messages. Not only is AMOEBA capable of producing the entire Roman alphabet on the water's surface, it can conjure a number of symbols, too. Marketers are already looking into the technology for use in amusement parks and hotels to enhance existing decorative fountains. Just one more step toward covering the entire world in ads.