| Fig. 8 | Fig. 9 | Fig. 10 | Fig. 11 | Fig. 12 | Fig. 13 | Fig. 14 |

Fig. 4. Two inference rules that are applied successively
to a shape. The first rule
is the Symmetry-Curvature Duality Theorem, which states that
to each curvature extremum, there corresponds a unique symmetry
axis terminating at that extremum. The second rule is the Interaction
Principle, which states that each of the axes is a direction
along which a process has acted. |