As Dr. Rank enters the apartment, stage direction tells us that "it begins to grow dark." The darkness does not seem to bother Nora at this point because she and Dr. Rank are long-time friends, and there seems nothing strange in conversing with him even if the lighting is somewhat low. When he begins to suggest that he does not have much time left to live, Nora "grip[s] him by the arm" and grows clearly agitated and concerned.
Nora and Dr. Rank discuss the unfortunate fact that his father's indulgences during his lifetime seem to have affected Dr. Rank's own constitution. They talk of the rich foods, euphemistically referring, perhaps, to the man's intemperate sexual appetite. Nora purports to find this sad, and Dr. Rank seems to interpret her response as flirtation. Shortly thereafter, Nora shows him her silk stockings, which are "Flesh-coloured." She even gives him permission to look at the legs of the garment and playfully calls him "naughty."
It is only when Dr. Rank confesses that
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