As is mentioned earlier in he story, the wife has always had a vivid imagination, and her husband plays off her mental creativity. This reduces the wife to a child's status and further alienates her from the rest of the world. The cumulative effect of all the oppressive aspects of this woman's life is what forces her to externalize her emotions and creative abilities to the inanimate objects of the nursery and the yellow wallpaper that decorates its walls. It is through the wallpaper that we have the full expression of a woman whose opinions and desires have never been recognized in the real world. This wallpaper, the very thing that this woman hates most in the house, is what ends up being the focal point of her expression.
Life is so much more interesting now than it used to be.
You see I have something to expect, to look forward to, to watch. . . . He laughed the other day and said I seemed to be flourishing in spite of the wallpaper. I turned it off with a laugh.