Piano Stairs - A New Reason for Choosing Staircases 2 Favorite 

“Piano Stairs” is an interactive playful musical stairway installation created into the Odenplan underground station of Stockholm to make people use stairs more often than elevator. The project was part of a Wolkswagen initiative called “The fun theory” whose main objective and mission is to “change people’s behaviour for the better by making it fun to do.”

“Piano stairs” have been a hit in cities worldwide, from Milan, Italy, Santiago to Chile, China and more. Studies have shown that when faced with the choice between climbing stairs or riding the escalator, subway commuters choose to take the stairs 66 percent more often if they're piano stairs.

Source comes from: http://www.cmuse.org/10-amazing-piano-stairs-from-around-the-world/