Andrzej Wajda's film about the Polish Film School is personal look at the Polish cinematography and an analysis of the phenomenon. He mentions the creators of Polish cinema - directors, actors and operators. Analyzes the reasons for foreign interest in Polish cinema audiences and critics. "Lesson" is illustrated with excerpts from the beginnings of the postwar Polish school of film and newsreel films. The film is dedicated to "Film Discussion clubs were, faithful viewers of Polish cinema."