Film posters contain countless deliberate and intricate design cues. Mood lines, explained by this blog, subtly convey emotions and themes. This poster, from Miyazaki’s Spirited Away, uses both stable and unstable lines. Unstable lines are created by the hanging lights while the slight curve of the house creates a stable line. The dichotomy between stability and instability is present throughout the film, and—as we see here—is incorporated into the film’s poster.
A complete list of mood lines can be found in Landscape Architecture, by John Ormsbee Simonds.