The drawing is geometric analyzing the shape as a plane. It has a formal structure because the structural lines guide the formation of the design. It is an active structure because each object is divided from the others and forms its own space. This drawing has an invisible structure because the structural lines are conceptual lines.
We can see in this image a repetition of shape since we see the same repeated pattern of that material.
In this case we can see a repetition of color in the image.
Here, we can observe how two objects can be similar but not exactly the same: Similarity of shapes. In this case it is association because these two objects can be grouped by their similarity in their forms.