You know when you look at something and it sparks a memory but you can't quite place it....then you look again and it just clicks!
This fabulous mega stone at Avebury just reminds me of a seated, female nude torso...so often represented in Art.
Think of Degas, 'woman at her bath'.... Several Picasso's....and even the fabulous photo by Man Ray 'Ingre's Violin', a picture of a female seated nude which even inspired Madonna in her series of black and white photos where she is seen from the back in a laced corset....
Ironically, Picasso's Blue Period fits with the stones, as they too are referred to as Blue!
Abstract maybe, or maybe not... depends on how you look!