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Originally Posted by tashirosgt
The boards-and-strings theory needs elaboration. One possibility is that the layout is done with GPS...
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You're joking, right? You do realize man-made crop circles predate GPS deployment by several decades...
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Another possibility is that that certain landmark points are put down days before the crop circle is completed...
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Not necessary.
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Another possibility is that the design of the circle incorporates certain nice geometric coincidences that makes laying it out easy.
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Bingo, and with a single length of rope, at that. Fully capable of bisecting angles, creating triangles, and subsequently smaller circles.