Argento invited his mentor, Mario Bava, to provide some of the optical effects, matte paintings and trick shots for the film. Some of the cityscape views seen in "Inferno" were actually tabletop skyscrapers built by Bava out of milk cartons covered with photographs. The apartment building that Rose lived in was in fact only a partial set built in the studio—it was a few floors high and had to be visually augmented with a small sculpture constructed by Bava. This sculpture was set aflame toward the end of production and served as the burning building seen in the climax.