Who is flat and who is a round character in "The Doll's House" by Katherine Mansfield?

In this excellent story there are actually very few round
characters. Remember that a flat character can be compared to a paper doll - they are
two dimensional, with only one or two key personality traits. A round character has the
three-dimensional qualities of real-life people, with many traits and
complexities.

Given this distinction, let us consider how
the characters in "The Doll's House" measure up. It is clear that out of the Burnell
children, it is only Kezia who is a round character. The others are only interested in
flaunting the Doll's House to gain standing amongst their friends and in mocking the
Kelvey sisters. It is Kezia who shows she is a more rounded character, and the author
gives us lots of information about how she is struck by the
lamp:

But the
lamp was perfect. It seemed to smile at Kezia, to say, "I live here." The lamp was
real.

Kezia's focus on the
lamp and her thinking about it show that Mansfield is presenting her as a round
character.

When we consider the Kelvey sisters, at first
they are presented as flat characters - easily distinguishable because of their way of
walking and bearing themselves - Lil's silly smile and Else always hanging on to her
sister. Yet, by the end of the story, we see that there is more especially to Else. Her
comment about seeing the "little lamp" is highly significant, not least because the lamp
is an important symbol in this story, but also because it shows that she is not the
stupid, silent girl that everyone takes her for and she is able to think at a deeper
level.