In z for zachariah why did ann refer to the store as an illusion?

In "Z for Zachariah," Ann refers to the store as an illusion because it represents a false sense of safety and normalcy in a post-apocalyptic world. The store, filled with goods and supplies, gives her a temporary feeling of security, but she realizes that it is ultimately an empty facade in a desolate environment. This reflects her understanding that survival is more about the harsh realities of her situation than the comforts of material possessions.