During the 1980s and 1990s, crop circles were popping up all over the world, causing fear and intrigue about their origins.

Mysterious patterns in crop fields caused a sensation ... "I just thought, 'You should write a book about two men who make crop circles over the course of the summer of '89 and they'll be called ...

It is not known who - or what - created the pattern, which is believed to have appeared in the cornfield some time last week. Mr Johnson said he hoped to capture more crop circle images in the future.

If you're looking down on the Hawkeye State from a Bird's Eye View, you might be surprised at how many of these you can spot.