What object in the doll's house is Kezia's favorite?

In "The Doll's House" by Katherine Mansfield, we meet Kezia Burnell. She is a rich, privileged girl who gets a beautiful doll house as a present for her and her sisters. She is fascinated with the present, but in particular, with a little lamp in the middle of the dining room table. Kezia thinks the lamp is beautifully made, and that it looks real. It looks so real that it makes her feel as if she can claim to really live there.