The interpersonal sequences of communicative acts and behaviors that characterize interactions also provide the foundation for intrinsic rewards. Blau (1964, p. 16) describes such a brief sequence, where one individual expresses gratitude for a favor provided by another in public, thereby simultaneously improving the image of the other, who then returns the favor and so on, extending the exchange of rewards. Hence, these initially bilateral rewards, many of them described under rewards provided by other (see 1.5.4), become relational as the parties establish ongoing exchange.