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I have wondered whether cairns and the like are often found on peaks and elevated ground because that's just a prominent spot, or whether the prominent spot is there because its a good place for a cairn. There does seem to be a pattern and some kind of a system to the interaction between monuments and their sightlines, with the lay of the land playing its part. Either a great deal of trouble went into creating a complex jigsaw or something else is at play, hence the grid. I can fully believe it has an influence on land formation. How much of an influence is another matter?
I like the analogy of the Itch moving when it's scratched. That's a good description of the transfer of a trend from place to place around the grid.