The Bellagio fountains go off four times an hour once sunset comes to the Las Vegas Strip. Each show is no doubt impressive, sending plumes of water spiraling into the air as echoes of pressurized cannons thunder through the plaza. Yet, by the third or fourth performance, the fountains begin to lose their luster. And after a few days of walking past them, they ultimately fade into the mundane, one of many once-in-a-lifetime spectacles vying for oxygen on the Strip.