Thickness varies depending on the number of tool layers included. The ejection of the outer layers forms a planetary nebula. The gaseous atmosphere gradually transitions into the internal liquid layers. It was probably covered by thick muscle layers. Its capabilities and structure are those typically associated to such network layers, including routing. In between the two top layers was of insulation. The cells making up these two body layers are relatively simple. It is made of a limestone core covered with painted stucco layers. The blue lines mark the boundaries of the (horizontal) protocol layers. These features are cloud clearings that reside in deeper cloud layers. The projections from the deeper layers are more extensive. It consists of three layers and three aspects. This allows for turbulent mixing of the two layers. Tying is another technique of fastening the three layers together. The model groups similar communication functions into one of seven logical layers.