Structural analysis of Klee's two [Siblings]

I found these works online. It seems that Klee had great interest in this series. looking at the work on the right, you can imagine how this composition was made. Make six rectangles with wire and overlap them. Tie the corners with short wires. Then think of the wires as elastic strings, and consider the whole pattern as a mesh with only curved lines. Add two pairs of dots as eyes, two pairs of lines are legs. This process is at the level of two-dimensional illusion. The work on the left can be made in the same way. Since both are clearly composed of arcs only, let's make a model of arcs. The work on the left can be made with arcs of eight types of circles, while the one on the right is a model with only six types of circles. Try extending the arc. It can be obviously seen that the largest circle forms the basic structure. Make all circles visible. Enclose the circles lined up horizontally or vertically with a rectangle, Count the number. ...