The Structure of Crystal () is a 1969 Polish film directed by Krzysztof Zanussi. It is his debut feature, and it won the Mermaid Award at the Warsaw Film Festival.
Jan and Marek were once physicist colleagues, but Jan left academia and became a meteorologist in a small rural town. Marek, who remained a scientist in the city, visits Jan and entreats him to return to scientific research and urban living. A spirited conversation ensues about values and ways of living.