This study examined the patterns of avoidance and recognition in pedestrians as they passed a confederate. Specifically, the effects of condition (avoid, look, and look plus smile) and sex of confederate on passing pedestrians were examined in a field study on over 600 participants. A log-linear analysis of the results showed support for the hypotheses of greater glancing toward the female confederates and greater glancing when the confederates looked and smiled. A Sex of Confederate ? Condition interaction qualified these main effects, however, with the female confederates receiving a much higher proportion of glances than men in the look-only condition. Analyses of additional pedestrian responses among those who did glance at the confederates indicated that the look and smile condition produced higher levels of smiling, nodding, and greetings than did the other two conditions. The apparent processes underlying these subtle, brief exchanges are discussed, and the ecology of passing encounters is considered. [ABSTRACT FROM AUTHOR]