YouTube - Piano stairs - Rolighetsteorin.se - The fun theory
http://www.youtube.com/watch?v=2lXh2n0aPyw

We believe that the easiest way to change people's behaviour for the better is by making it fun to do. We call it The fun theory.

"We believe that the easiest way to change people's behaviour for the better is by making it fun to do. We call it The fun theory." Excellent.