Light
Light is most often used to symbolize Nora's state of awareness. After Torvald claims to be man enough to take everything upon himself (Act 2) and while she is talking to Dr Rank, the light begins to grow dark. This symbolism refers to two processes. First, Nora is using her sexual attractiveness to manipulate the dying Dr Rank into giving her money to pay off her loan. When Dr Rank confesses his love for her, she is shocked out of her game. She brings in a lamp, telling Dr Rank that he must feel ashamed of himself now that the lamp has come.