Hey guys, i find this video very interesting! Basically, the goal was to get people to use the stairs more instead of the escalator. Therefore, a group of people installed piano keys on each step of the stair so that when people step on it, it will play a note. I find that this is a very smart idea to get people walking more instead of being lazy! THE FUN THEORY!!!... This is a good way to incorporate into our designs, to get people playing!