At one point in the story, the narrator describes an area on the wallpaper: "There is a recurrent spot where the pattern lolls like a broken neck and
two bulbous eyes stare at you upside down. I get positively angry with the impertinence of it and the everlastingness. Up and down and sideways
they crawl, and those absurd, unblinking eyes are everywhere."
What is going on in these lines? What is the narrator referring to? Describe the effect the wallpaper has on the narrator.