Euler's identity encoded in a crop circle

> Nobody knows for sure how crop circles are made.

Maybe this guy does. http://news.bbc.co.uk/2/hi/uk_news/2191565.stm

These two, as well: http://en.wikipedia.org/wiki/Crop_circle#Bower_and_Chorley

edit: and anyone who reads this: http://www.wikihow.com/Make-a-Crop-Circle

More insightful analysis: http://www.cropcircleconnector.com/2010/wilton/comments.html

Someone must be playing joke on human brain ;-)