The Other/Mad

Possibly relevant outside information
"The Other" is a turn of phrase that occurs frequently in The Strange Case of Dr Jekyll and Mr Hyde. In that novella, Robert Louis Stevenson describes a man's attempt to separate the good and bad halves of his nature. As Stevenson writes of Jekyll's experiment, "Hence, although I had now two characters as well as two appearances, one was wholly evil, and the other was still the old [me], that incongruous compound of whose reformation and improvement I had already learned to despair. The movement was thus wholly toward the worse." Some readers speculate that Lucrezia created the Other by attempting to banish the evil parts of her personality and become a "good guy" like her husband Bill.