Full Idea
We need to think of concepts as organic entities that can persist through changes of extension.
Gist of Idea
Concepts can survive a big change in extension
Source
Gabriel M.A. Segal (A Slim Book about Narrow Content [2000], 3.3)
Book Reference
Segal,Gabriel M.A.: 'A Slim Book about Narrow Content' [MIT 2000], p.77
A Reaction
This would be 'organic' in the sense of modifying and growing. This is exactly right, and the interesting problem becomes the extreme cases, where an individual stretches a concept a long way.