The title of A Doll's House is a reference to the protagonist, Nora, and her domestic station in life.
Consider what a doll's house is in the literal sense of the term. It is quite beautiful and meticulously put together, but that is because its only purpose is to be viewed and admired. It is not meant to serve any utilitarian function or possess any practical value. It could honestly be considered to be a toy, a fixture, or even a trophy. Indeed, this is certainly how Torvald seems to consider his wife. The most immediately striking aspect of how he regards her is his tendency to treat her like a young child, forbidding her from indulging in sweets and chastising her playfully about the most trivial of matters.
Just as a literal doll's house's decor is likely to starkly contrast the world around it, so too is Nora's life a completely isolated bubble from the outside world. The central conflict of the play that relates to the secret loan serves as Nora's exposure to the world outside of her...
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