A production shot from the Ringing Rocks project. The actual rocks at this certain location outside Butte MT are lithophonic: they make a tone when struck. Butte was also, for decades, one of the world's richest mining towns, and a leading producer of copper ore.
This was in some ways a follow-up to a simpler gong-like thing made on a rock on the James River in 2009 in Richmond, Virginia