What does it mean to say that every production of The Doll House is an interpretation?

THE DOLL HOUSE 1. What does it mean to say that the “fourth wall” has been removed? How does this fact help us to follow and understand the dramatic action on stage? 2. Playwrights often overturn or modify our expectations or character to surprise us, or to make a character a deeper, more interesting subject. Explain how Ibsen achieves this with Nora’s character by comparing what Nora seems to be early in the play to what she does become as the play draws to a close. 3. What does it mean to say that every production of The Doll House is an interpretation? 4. Explain the importance of Mrs. Linde’s complex past (and her involvement with Krogstad) to the play. 5. Explain the cultural and social significance of the end of the play when Nora leaves everything behind and slams the door.