This does not fit my theory very well.
Stone mounds © Sunny cc-by-sa/2.0 :: Geograph Ireland
I recall a story of a group of 11 Indians, showing up in a canoe, in Britain. These rock piles in the pictures at this link make me wonder if Indians got to Ireland. After all, it is not easy to abandon a (my) long held theoretical belief.
To be fair, there are other reasons to form grids. Specifically to place things evenly. Like plants.
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