August photo a day challenge: Pebbles, stones, rocks

During a visit to the Shelburne Museum in Vermont last year, I noticed an odd sign posted in the grass next to the walking path: Please Stay on the Grass.
It was then that I realized I was looking at an art installation. Who knew? I love smooth stones, which I usually only see at the beach. This was something entirely different.
I was intrigued.
The artists’ information was posted nearby:
