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![Strange Case of Dr Jekyll and Mr Hyde](http://up.wiki.x.io/wikipedia/commons/thumb/7/78/Dr_Jekyll_and_Mr_Hyde_poster_edit2.jpg/350px-Dr_Jekyll_and_Mr_Hyde_poster_edit2.jpg)
An 1880s poster for Strange Case of Dr Jekyll and Mr Hyde, a novella by Robert Louis Stevenson known for its vivid portrayal of a split personality, wherein within the same person there is both an apparently good and an evil personality, quite distinct from each other. It was a huge success, with over 40,000 copies sold in the first six months after publication.