“Wind” is a machine that converts sound intoto air motion. For the experimentally inclined:  if you’re not curious, nothing happens.

A quote: “Grownups are not the best experimenters in the world, but some managed to play with the microphone and the hair drier. Of course it was kids that did the most interesting things with it, no surprise there.  I reallyshould take this experiment  to NEMO,  the largest science centre in the Netherlands and  the perfect place for anyone with an inquiring mind.  One of my teachers at Tractie suggested this – and not by way of a compliment. He ‘did not like art that was about technology’. Which to me is just as stupid a statement as saying ‘I don’t like art that is about paint’.”

More to be read about this contraption and its variations  here