The inner circle in the formation fits exactly in the equilateral triangle of the basic pattern. The next formation however shows us differently. In spite of the complex character of this formation, it can be constructed without trampling the standing crop. The following diagram shows the position of the necessary construction points. As you can see they all lie in the flattened crop.
Some construction points lie exactly on the edge of the standing crop.
It all fits just perfectly. Luckily', the central circle has the perfect shape. We see the same principle when looking at the following formation. If the inner circle of the standing crop had been just a tiny bit bigger, this formation could not have been constructed without damaging the standing crop. But also this formation has the perfect size.