Similitudes des longueurs et des vitesses (1948) is a playful yet rigorous cinematic exploration of scale, proportion, and motion. Using scientific models and visual analogies, Jean Painlevé illustrates how physical laws apply across sizes and speeds, from the microscopic to the monumental. Through clever editing and visual experimentation, the film reveals the hidden harmonies of nature, where length and velocity dance to the same mathematical rhythm. A fascinating fusion of physics and film, it exemplifies Painlevé’s talent for turning abstract concepts into poetic visuals.