Funtheory: The Piano Stairway. How fun can change people's decisions.
Volkswagen has come up with a nifty way of encouraging people to exercise more by making climbing the stairs a note-worthy experience. Overnight, a team transformed the stairs leading out of the Odenplan subway in Stockholm, Sweden, into a giant functioning piano keyboard. Applying pressure on each step played a musical note.

Commuters soon opted for the intriguing new stairway and enjoyed making musical movements as they ascended up and down the scale. The car company found 66 per cent more people than normal chose the musical stairs over the escalator.