Rules for identifying centers
General rules which identify zones of space that stand out as centers:
- Sets which appear as entities are often, but not always, locally symmetrical
- Entities are usually bounded: there is often a sharp change of structure at their edge
- Some entities are marked by an internal center where there is another change of continuity near the middle of the center itself
- There is a simplicity and regularity about these sets which marks them as wholes, and makes them function as entities
- They are often relatively homogenous across their interior, compared with the surrounding space
- There is a topological connectivity in them which marks them as compact
- They are usually — not always — convex