Lights...Carmara...Theme!

The theme of the Yellow Wallpaper is insanity. This is the theme because when the narrator is sitting in the house, she starts to befriend a person in the wallpaper. She didn't show any signs of insanity before she went to the mansion. When the woman begins to show herself to Gilman; Gilman beings to act weird towards John. John didn't take mental illness seriously because he let her out and see other people.