The city of Stockholm revamped Odenplan subway station’s stairs to provide a wonderful alternative to the escalator. If an American city had done this, some citizens (mostly conservative Republicans) would call it a frivolous waste of public, funds.
However, Volkswagen subsidize the construction of these piano stairs. It’s all part of a project that believes the easiest way to change people’s public behavior for the better is by making it fun to do. See http://www.thefuntheory.com for more examples (I particularly like the World’s Deepest Trash Bin).