Jim calls Laura “Blue Roses,” a mispronunciation of “pleurosis,” a disease that caused Laura to miss some school during high school. The name “Blue Roses” turns Laura’s defect into an asset: her unusual, otherworldly qualities are seen as special rather than debilitating. Laura is closely based on Tennessee Williams’s sister, Rose, who underwent a lobotomy while Williams was writing the play, and the nickname is also likely in tribute to her.