I would like to see these little orbs come by my place once every two weeks and mow my lawn. Looks like they could certainly do the trick in quick order.
My cousin just looked upon the exercise as a waste of cultivated grain. There was a thunderstorm the night before, and my cousin insists the 'patterns' are caused by devil's tales which are generated in the thuderstorm winds.
At other locations, patterns appear that cannot be connected to thunderstorm activity, however. And some patterns of extreme intricacy appear over night in large fileds next to or visible from major highways, patterns so intricate that they could not be produced in a short time by determined hoaxers with boards and ropes. I happen to believe there are a significant number of 'circles' which represent graphic images of fractals offered as some sort of communication with Earth, but that's just me.
If I spent the money to plant and cultivate a grain crop, unless a real connection to extra-terrestrial/extra-temporal civilization were made, I would be pissed that my work was being destroyed for 'drawings'. My farming cousin sure doesn't welcome the destructions.