Architecture as a manifesto of the era - the film "City of the Sun. Leonidov" tells about the birth of constructivism and the search for a new language of forms. It is not just a portrait of an architect, but a living dialogue with the past, where the avant-garde becomes a challenge to the familiar and continues to inspire today. What is constructivism and why did it become the visual code of the new revolutionary Russia? The documentary film "City of the Sun. Leonidov" offers not just a story about the fate of the architect, but an attempt to look into the essence of the era when art and ideology went hand in hand, creating the world anew. Ivan Leonidov is an almost mythological figure. His projects seem incredible even today, and back then, in the early 20th century, they became symbols of the future. The film by director Maria Melnik is an intimate yet grand narrative about a man who dared to think in terms of utopias, where cities are not just places of life, but spaces of light, freedom, and order. The viewer is in for a visually precise, almost architecturally composed film, where each frame is constructed with the same accuracy as Leonidov's drawings. The cinematography by Maxim Arbugaev, Sergey Amirjanov, and Yuri Ermolov makes this documentary journey a true aesthetic pleasure. The succinctness of form combines with the depth of thought, and each frame seems to continue the ideas of the great constructivist. This film is not just a look back; it is an attempt to understand what we have lost by rejecting utopias. Why were Leonidov's ideas not realized? Why are they so relevant today, as we rethink urban space, the functions of architecture, and ways of life? The film will be of interest not only to architects and students of relevant universities but also to anyone who feels a connection to the past, who wants to understand how the cultural consciousness of the Soviet era was formed and why the artistic manifestos of the 20th century still sound fresh. This film is about the beauty of thought, the power of form, and faith in the creative human.