I have seen all kinds of fountains during my travels, and the one that left the deepest impression on me is the musical laser water curtain fountain in the north square of the Great Wild Goose Pagoda in Ci'en Temple, Xi'an. After the fountain is turned on, more than 2000 streams of water are colorful and varied, sometimes slow, sometimes urgent, sometimes low, and sometimes high, according to the rhythm of the music. Each nozzle is independently controlled by a water pump and a frequency converter. With more than 3300 color lights, 22 kinds of water shapes, and a laser water curtain that can be combined with a fire spring to burn and explode at a low temperature at a height of 6 meters, it looks like rainbows dancing in the air under the sunlight or light, and more like color screens hanging in the air.