
At least some crop circles are not made by human beings. I refer to those crop circles that created themselves instantly underneath small planes looking for crop circles. There are also crop circles deep inside large fields of densely packed wheat with no pathways leading to the crop circle. So, I think at least some crop circles (probably most) are made by one particular species of star-traveling humanoids. Either their craft or their robots that make the crop circles are small balls of light that travel very fast.

Now the interesting question is, what do the crop circles mean? Are they a message? I don't think so, because that would violate the Prime Directive, the only thing they got right in Star Trek. I do not wish to imply that visiting humanoids bother with the trash we call mass entertainment. I think they are like anthropologists, who never wish to change the primitive tribes they study, unlike missionaries, traders, government officials, or conquistadors. IMHO, anthropologists are quite a cut above those other listed types. I shall call them more evolved, for want of a better term. So my theory is, only highly evolved humanoids have the ability to jump lightyears in an instant, a necessary ability for star travelers. Even Warp Nine or other FTL schemes would be too slow. The universe is too vast. Star-traveling humanoids probably live far apart from one another, hundreds of light-years at least.

OK, same question again. What do the crop circles mean, if they cannot be providing us with any information? Well, they could be a stimulus to our creativity and our curiosity. They may lead us to think about ley lines, and symbolism, and higher math, and all sorts of things. That would not violate the Prime Directive.
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I'd really like to see some photos of crop circles inside of fields of densely packed wheat (or whatever) with no pathways to them. I've looked at hundreds of photos of crop circles on various websites, but in every single one, the crop circles were intersected by a path (usually a pre-existing one) where someone could have walked. If you have a link to any of these photos, please post it.