NIL tends to transform efficient Gaussian[D] color naming systems to become more similar to the WCS. The difference score is dissimilarity to WCS (minimum gNID to any WCS system) before NIL, minus the same quantity after NIL. Values above zero (marked by the dashed vertical red line) indicate that NIL has brought a system closer to the systems of the WCS. There is a clear trend toward positive values, indicating that NIL tends to transform already-efficient systems into systems that are more human like.