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This is a sketch of what stands out on the photos of Stone 16.
Maybe the features show up more on days [or times of day] when the light is most beneficial, so perhaps those were the important dates or times to view them during rituals or ceremonies?
(i.e. the sunrise on 6 Dec for the V mark on the inner face, which would also compare to the angle of the sun on 5 or 6 January.)
http://www.megalithic.co.uk/modules.php?op=modload&name=a312&file=index&do=showpic&pid=38380
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