I know I am going to come across all too cocksure about this, but crop circles are related to
cymatics.
Waves of electromagnetism consist of transverse and longitudinal waves. I use the term "electromagnetism" very loosely here. The longitudinal
component simulate waves of sound.
As the molecules within the plants at specific points are made to vibrate, they become "hot", causing the stalks to deform and bend.
So the design is not as fundamental as the frequency or more exactly the combinations of vibrations that went into producing the pattern. This is the
secret of sacred geometry, the "word" or that specific vibration that produces the pattern with all of its intricate ratios.
Our technology is capable of producing these patterns, and has been for at least a hundred years. This does not automatically discount the possibility
one of our own non-human tenants could also do the same thing. One example is dolphins, which transmit pictures of their surroundings to each other by
using sound.