Crop circles are patterns that appear in fields. The pattern is
created when certain areas of the crops are tamped down, but others
are left intact. The edge is so clean that it looks like it was
created with a machine. Even though the stalks are bent, they are
not damaged. Most of the time, the crop continues to grow as
normal.
Sometimes, the patterns are simple circles. In other instances,
they are elaborate designs consisting several interconnecting,
geometric shapes.