The “Time and Tide Bell” by Marcus Vergette is very cool. From his website,

“This project is to make a permanent installation of the Time and Tide Bell at the high tide mark at a number of diverse sites around the country, from urban centres to open stretches of coastline. The rise of the water at high tide moves the clapper to strike the bell. Played by the movement of the waves, the bell creates a varying, gentle, musical pattern. As the effect of global warming increases, the periods of bell strikes will become more and more frequent, and as the bell becomes submerged in the rising water the pitch will vary.”