"This spectacular design is based on the Golden Mean spiral, a mathematical ratio found in nature, and commonly referred to as phi. The diagram above shows how to build one Golden Mean spiral by using a square and applying the phi ratio (1:1.618) to generate the various compass points required to grow the spiral. In the case of this crop circle, this would then have to be repeated 22 times, reversed and overlaid (shown below); fourteen concentric rings are then inscribed to complete the matrix. Then it's a matter of simply laying the crop in alternate segments."
(http://www.cropcirclesecrets.org/crop_circles_history00c.html)
(Woodborough Hill 2000)
(http://recursostic.educacion.es/artes/plastic/web/cms/index.php?id=2175)
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