If you take a number "9", mirror it, and lie it on its side, you get the shape of a rock pile. Here are three examples from the Midway site in Acton.
The next two have one extra rock, near where the tail of the "9" would end, if it curled slightly.
(I guess I should go back and clean these suckers off and take pictures on a cloudy day, so you will be able to see what I am talking about.)
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