The crop circle phenomenon has spread several decades ago and every year there are more and more of them. They appear in different parts of the planet and there is no clear version of who can leave them.
It is clear that scientists do not consider the version of the signs of extraterrestrial civilizations and are inclined to believe that these are the tricks of people who want to give such a phenomenon an aura of mystery. But many of the figures are so complex and huge that it is difficult to imagine people who would start doing this. So maybe the signs are left to us by other civilizations in fact?
Some of the people claimed that it was they who made these circles and then the scientists rejoiced. Like, here's the whole explanation and you shouldn't refer to mythical extraterrestrial civilizations. But later it was proved that people who admitted to applying these signs could not be at the same time in different places where circles appeared with a difference of several hours.
Of course, most of these signs are made by people, but there are so many of them in the world that some of the circles may have a completely different origin. In some circles, information about our planet was encrypted, which also could not be done by people far from science. But would scientists do this and spend hours recreating circles to have fun?
While this question remains open, the circles are not a complete hoax, but only a partial one. It seems to me that rare specimens may have a completely different origin, only our scientists have not yet reached this level of discussion.