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Central stone, Boscawen-ûn, Cornwall
Displayed here with the ‘matcap shader’ enabled is the central stone at Boscawen-ûn stone circle in the far west of Cornwall, UK. Rock art has been recorded on this stone, and there is now debate as to what it represents. Are they axes, as existing interpretations suggest, or are they feet, soles outwards? The latter is my interpretation, as detailed on my blog: http://tom.goskar.com/2015/09/14/neolithic-breton-style-rock-art-at-boscawen-un-stone-circle/
I discovered two circular mounds on the stone which I believe could be similar to those interpreted as ‘breasts’ in the chambered tombs of Brittany, France.
Turn the model and see how the shader shows the markings, and see what you think. You can enable the natural texture of the stone from the settings (cog) icon. Let me know in the comments.