Final answer:
The evening reading sessions in 'To Kill a Mockingbird' reveal a pattern in the changing appearance of the wallpaper. This pattern symbolizes themes of imprisonment and confinement in the novel.
Step-by-step explanation:
In the evening reading sessions in 'To Kill a Mockingbird', a particular pattern emerges. The narrator, Scout, observes that depending on the lighting, the appearance of the wallpaper in her room changes. In sunlight, the pattern appears one way, but by moonlight or in artificial light, it transforms into bars. This pattern reflects the theme of imprisonment and confinement in the story. The recurring pattern of the changing wallpaper symbolizes the constraints and limitations faced by various characters in the novel.