I've read countless posts on differences between Entities and Value objects and while I do think that at least conceptually I understand how the two differ, it appears that in some of these posts authors consider a particular domain concept to be a VO simply because it is immutable ( thus its state will never change, at least within that particular domain model ).Do you agree that if the state of an object will never change within particular domain model, then this object should never be an entity?  Why?
DDD: Can immutable objects also be entities?
domain driven design