Conceptual evolution in Asa H

Because of the hierarchical organization of the Asa H memory some concepts/categories evolve (change) substantially and quickly while those at other (higher and/or lower) levels (or the same level) in the hierarchy evolve (change) very little and/or slowly.  "health", "handle", and "house/home" are examples of concepts that we have seen evolve substantially while "direction" and "near" are concepts which we have seen change very little once created.