Corollary: A collection of metaphors chosen by one group, is followed by repeated efforts to kill off members of another group (with slightly different ones) - an observable characteristic of the only example extant of this life phenomenon, at least among the most imaginative of the creatures. (Who are like us - therefore must be important)
See Dawkins 1976 and Dennett 1991 for discussions of memes and how they propagate and compete.
cordially,