The consistency of recorded observations worldwide demonstrates a common effect or situation. That's all there is to it really. And the late Gerald Hawkin's mathematical extrusions. I also have pretty good knowledge of student groups and 'voluntary conservation'. The numbers of people needed to create structures on these scales are far too obvious for the locals. The experience of these pages shows how difficult it must be for a group to come up with a design, even. Much less execute it perfectly and silently.
So the Thornborough crop circle that appeared on the Summer Solstice must have relevance. Even if only as a Yantra. To dismiss electro-kinesis (say) out of hand, without consideration, is to cut off part of the world - become deaf.