Check out this site: www.cropcircleconnector.com
The best Crop Circle site I've found featuring this incredible image in its August section.
I find these so fascinating and believe that they (the good ones) are not man-made.
This one appeared on a night memorable for its constant torrential rain!
It's massive and its geometric pattern is so complicated it would have taken days to create with 'planks & string' (as the hoaxers claim are the tools of their trade)