Riverside Art?

Number two in the Curious Cumbria series.

The thing which Chloe is sitting on is...well, it is a sort of plinth, and there are three more behind her...

This is a bit of art on the edge of Bitts Park beside the Eden. The pieces of rock standing on the plinths are carved and become rounder on each one. I suppose we are seeing the ball being liberated from the rock.