The math involved in some of them looks fractal to me, which would mean that it would be pretty easy to be precise, because its an iterative approach.
What I would be very interested in seeing, though, are pictures of crop circles where the perpetrators messed up, or abandoned their effort part way through. First, that would give you an idea of how they progress the work, and also, it would be interesting to see what kind of rookie mistakes get made. I mean these people, aliens, or whatever, they gotta start somewhere right? Surely they goof on a couple along the way...
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-Scott
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