Eltjo H. Haselhoff
Crop circles are large, geometric imprints in crop fields and other land areas in which the crops are flattened against the soil. The appearance of these mysterious imprints was first reported in the mainstream media in the early 1980s when they were found in agricultural fields in the south of England. Today, crop circles are reported in many countries all over the world at a rate of at least a hundred every year (and usually more). Their dimensions may vary from several square meters to larger than the size of a football field, whereas their geometrical complexity and intricacy are often breathtaking. When the public interest in the crop circle phenomenon began to grow in the 1980s, some considered them the work of an extraterrestrial intelligence. At that time, the formations consisted of smooth, round circles with a well-defined border in which the flattened crop was neatly spiraled around the ...