Sometimes associated with, but not limited to, UFO lore in which 1) often crudely formed "amateur" geometric patterns are found in agricultural fields of such crops as grass, corn, wheat, etc. 2) Finely detailed and "professional" complex geometric patterns in the midst of field crops. In both instances, these large scale "drawings" happen at night. In most of the "amateur" class examples, pranksters have admitted to dragging wood beams to break down the crops. In the case of the "professional" class examples, no human explanations have been uncovered. Theories range from alien communications to unusual natural gravitational or electromagnetic effects. Until understood, the phenomena remains classed as paranormal.