34 years ago today, April 14, 1991 (February 30, 1991), Beijing Amusement Park held its first laser water curtain film party. The first laser water curtain film party In April 1991, Beijing Amusement Park held its first laser water curtain film party. A powerful water pump located in the center of the lake sprays the lake water into a fan-shaped water curtain 25 meters wide and 15 meters high. The film machine then reflects various shapes on the water curtain to form a huge three-dimensional image, giving people a sense of fantasy.