Concentric Circles

I picked this seaglass up on my walk yesterday... on our beach! Never before have I come across more than one lone piece of seaglass here. There are a few more bits besides (they didn't fit in my arrangement).

Actually I'm not sure if it counts as our beach, because although it may have been in the same 'bay' this particularly section was closer to (make that beyond) the next village along. So I'm not sure about that. At any rate it's short of an hour's walk away, which is closer than anywhere else.