These are grooved iron blades of an old hydro-electric turbine (1924–1994) standing on the bluffs above a River dam.
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The turbine is around 10-foot-tall.
I came across it when I was biking along the river yesterday.
It's from the former Motor Plant,
which harvested energy from the river dam below.
The iron blades were worn (by water?) where they curve--I circled the area in yellow.
The grooves are surprisingly different from one another,
like bones and bodies.
They are so beautiful, I walked around and photographed each blade.
Info plaque on the turbine:
