Have you ever built a cairn?
I’ve built hundreds of cairns, mostly when tramping, to mark places where for some reason the path is difficult to find, and some help is needed.
We have a beach a few miles south of here where for some reason people started building cairns, and they have become a miniature forest. Have built a couple there myself, just because.
I like playing with rocks, both in the coastal space, and in active riverbeds.