It’s a who done it
There we were enjoying the beach at Charmouth and unbeknown to us someone behind was carefully balancing all of these stones.
When we finally turned round and noticed them, whoever had done it had already gone. I can only guess at how long it took them to balance them all. They are either exceptionally skilled (some of the stones look really improbable) or had a steady hand and a lot of patience. Either way I think they look cool.