Humanity has been, is now, and will be attracted to patterns. "The Three Hares" pattern is repeated throughout many cultures as well. That doesn't mean it has any spiritual connotations, whether people attribute them or not.
Just cus I don't agree on every point doesn't mean I don't respect a well thought over piece of work, though.
BTW, Crop circles are usually geometrical because that makes them easy to orchestrate from the ground without a bird's eye view.