Sculptor's waterfront contraption is played by the tides - San Francisco Chronicle (subscription)

Tim Hawkinson emerges from the huge shipping container which has been made into a giant bellows which by using wave action from the Bay creates the pressure to make the sounds through a converted bicycle, "Bosun's Bass" an art installation by... July 21, 2015. Los Angeles artist Tim Hawkinson installs a big new commissioned public art installation at the Exploratorium, "Bosun's Bass," a tide- activated sound work that evokes the bosun's pipe whistle used by mariners. Source: www.sfchronicle.com