Even a single common crop circle pattern is very reminiscent to a pattern, created by iron sawdust scattered on the board, through the wire leads perpendicularly, passed through by electric current (magnetic field of a straight wire).
Kahit isang solong karaniwang pattern crop bilog ay lubos na nakapagpapaalaala sa isang pattern, nilikha sa pamamagitan ng bakal sup nakakalat sa board, sa pamamagitan ng wire humantong paperpendikular, ang pumasa sa pamamagitan ng electric kasalukuyang (magnetic field ng isang tuwid na wire).