Cf Meaden "Secrets" page 88
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|I suspect that this monolith originally sported a natural roothole that the sculptor enlarged artificially, leaving a characteristic "terraced" effect around the newly enhanced eye. The forehead, nose and implied mouth would then have been chipped into existence at the appropriate distance from the semi-natural eye. A similar construction process may well have taken place on Stone 10 visible here.
Image copyright David Baldwin Night Photography