Scene from The Strange Case of Dr Jekyll and Mr Hyde by Robert Louis Stevenson, 1927. Artist: Edmund Joseph Sullivan [Getty Images]

Scene from The Strange Case of Dr Jekyll and Mr Hyde by Robert Louis Stevenson, 1927. The features seemed to melt and alter. Mr Hyde, having taken the antidote, turns back to Dr Jekyll in front of Dr Lanyon. Jekyll had succeeded in separating out the duality in his nature, Hyde representing pure evil and Jekyll good, but eventually the antidote to the Hyde persona ceases to be effective. From The Strange Case of Dr Jekyll and Mr Hyde by Robert Louis Stevenson. (London, 1927). First published 1886. (Photo by Ann Ronan Pictures/Print Collector/Getty Images)

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