Cute video of the reactions of people in a Swedish subway station when “musical stairs” were installed. Anyone who has been to the Museum of Science in Cambridge over the last 20 years or so has undoubtedly walked up and down their musical staircase at least once, although that staircase has more of a random layout of musical sounds rather than the direct analogue of a piano keyboard. Last time we were at the museum, the staircase had been disabled temporarily (well, musically, at least), but this video reminded me of it instantly.
