I just saw these two videos which made me smile.

These videos shows that something as simple as fun is the easiest way to change people’s behaviour for the better. I sure love the piano stairs! haha

[youtube=http://www.youtube.com/watch?v=ivg56TX9kWI&fs=1&hl=sv_SE]

[youtube=http://www.youtube.com/watch?v=SkQbMKc58Nc&fs=1&hl=sv_SE]

See and read more here:

http://www.thefuntheory.com/