Shenyang residents walk on “piano stairs”, May 13. The stairs are located on a street in Shenyang, Northeast China’s Liaoning province. With infrared sensing devices on each step, the stairs make the sound of piano keys when people walk on them. [Photo/VCG]

Shenyang residents use their feet to play music on “piano stairs”, May 13. [Photo/VCG]

Two people try “piano stairs” in Shenyang, May 13. [Photo/VCG]