Some researchers believe that real crop circles are advanced pictogram and mathematical communications from another dimension. However, for many decades, researchers were puzzled about the visual images of crop circles. Now, the breakthrough of 3D Fractal Resolution Imaging helps solve the puzzle. Most investigators believe that the FRI is the solution to the long problem in interpreting messages of crop circles.
Crop circles were already reported and documented as early as the 17th century. The phenomena of crop circles were ignored until the 1950s when UFO researchers became interested to the designs. The circles were common in Great Britain, U.S. and Canada. More on http://www.ecropcircles.com/
Below are some pictures I’ve gathered so far: