(iii) The formation of ring-shaped structure

When you bend a lineal-extended shape and combine its ends, a ring-shape with a large interspace in the center is produced. It is indeed a settled shape with a feeling of completion. 
 
 


166
 
167

 

168

 

Figure 166: Plane-surface composition of units.
Figure 167: Ring-shaped composition with arrow-shaped units.
Figure 168: Ring-shaped composition with arrow-shaped units (pure 4A1-type units).


 

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