The first shot shows students descending a staircase in calm, orderly fashion, then the second details the same action as a chaotic rush. Separated by slates and director Abbas Kiarostami’s voice intoning, “Sound, camera,” subsequent sequences describe the same dichotomous behavior in a schoolyard, on a school bus, and in the haphazard traffic of Tehran. Kiarostami described this as “a truly educational film,” but it plays more like a quirky philosophic aside.