No vitriol from me, SG. I was just pointing out there was an entrepreneurial element to some of the manmade circles - and we all agree some of them are manmade.

Personally, I've not seen any that couldn't be man made so I take the "likely" route rather than the other one. On the other hand, I've seen a lot of storm damaged crops, often in pretty circular forms. No-one can say for certain if those are purely due to rain and wind. They certainly aren't man made.