Horatian principle: "As painting, so poetry" — visual image equals literary text in authority and complexity. Theoretical justification for cinema as successor to literature.
Horace's dictum "ut pictura poesis" — as is painting, so is poetry — became the guiding principle for all who wanted to grant cinema literary authority. On set, it works like this: the director does not work against the text, but replaces it with image composition. A scene that takes three pages in the novel is concentrated in the image through a camera movement, a lighting mood, a glance. This is not illustration of the text — it is transformation into the visual.
The practical consequence of this aesthetic is crucial: Mise-en-scène becomes the literary instance. The image frame takes on the function of the narrator. If a complex emotional or philosophical statement is needed, it is not given as dialogue, but as spatial arrangement. A character isolated on the left in darkness, another on the right in light — this achieves more than ten lines of monologue. This is "ut pictura poesis" in an operative sense: the image speaks like poetry, with depth, ambiguity, rhythmic quality.
Historically, this maxim was a weapon against critics who treated cinema as mere entertainment or as a subordinate art form. Filmmakers like Orson Welles or Bresson could refer to Horace: The visual-cinematic is no less artful than literature, but an equal art form with its own laws. This continues in the realm of editing — montage becomes a narrative method, editing rhythm becomes rhythmic composition, sound space (cf. Sound Design) becomes the voice of the film.
Today, this idea seems almost trivial, but it is not. It explains why some directors fear too much dialogue, why Visual Storytelling should not just look beautiful, but must think. "Ut pictura poesis" ultimately means: the frame is your medium. Use it like a poet uses words.