A THEME is a message or idea about life that is implied or stated in a literary work. What is the main theme of this play?

There are a number of major themes you can consider. I am partial to the artificial facade of this marriage as implied in the title of this play. The whole play takes place in one room. Until the last act, Nora is in every scene; she never seems to leave the room. The action of the play all comes to her. She is literally trapped in domestic comfort. She is given her “housekeeping” money by Helmer as though she is a doll in a doll's house. The play suggests that this treatment is condescending and not an appropriate way to treat one’s wife.