Bible myths, fairy tales, and science fictions all offer narratives that imply and sometimes question boundaries for human behavior. By subscription to certain narratives, individuals can enter and leave social groups; by evolving narratives, groups can adjust the realm of the allowable and the realm of the forbidden; and by selective transgression, individuals can gain power beyond that initially granted by the group. All these functions of narrative contribute to the sociobiological vigor of the individuals and groups that subscribe to (...) them, suggesting that the creation and use of narratives has proadaptive functions. (shrink)