Subway culture of Zhengzhou subway

On January 7, 215, Zhengzhou City, Henan Province, the exit C of the Convention and Exhibition Center Station of Metro Line 1 was opened, and the exit staircase turned out to be a special piano. The piano stairs are black and white like the keyboard of the piano, and whenever a pedestrian steps on the stairs, the corresponding sound of "Duo Rui Mi La Xi" will sound. According to the subway staff, the scales are set under each marble step, and light-controlled sensors are installed in the round holes around the steps to identify pedestrians passing by. When you step on the steps, the speaker at the top of the stairs will play the piano sound, and the lights under the steps will light up briefly.