If I were a prehistoric person going from place to place (or indeed if I were going to go from place to place today) I wouldn't find it much use to be pointed in a straight line to something 100miles away. I think I'd travel from landmark to landmark, river crossing to weird shaped hill. I might pop in on stone circles on the way. But I don't know why there's this thing about straight lines. Other than things lining up occasionally with the sun at the solstices, that might be interesting. But otherwise I wouldn't be moving in straight lines. Things don't really work like that in nature.
anyway that's just a reflection of my own mind. I'm not that bothered that X is exactly the same as Y. But I concede that whoever it was building the circles, if they did it because they liked Rules and Order and getting people to do what they were told, they might have liked that sort of thing. But I wouldn't.
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