Darkness and Evil: What are the uses of visualization in the story?

When Tom entered his Aunt and Uncle's apartment building "he felt a chill," and the narrator explains that the "heart of the house was empty - cold - dead." This imagery makes the building seem unwelcoming and cold and also foreshadows the fact that there will be supernatural events later in the book.

At night, the garden is described as being frightening and eerie. For example, the narrator writes that "a great stillness lay within the garden." Personifying the stillness in this way eerily suggests that there is a dark presence in the garden. The narrator strengthens this description, saying that "as he reached the porch, the winds broke out into the lower air, with heavy rain and a chilling of the temperature. Demons of the air seemed let loose in that garden." Here, the narrator introduces a suggestion of the supernatural, which further enhances the frightening scene.