October 31, 2017 10:00 AM EDT

In the centuries since the legendary 1816 evening when Mary Shelley — then still the teenaged Mary Godwin — first began to tell the tale of Victor Frankenstein and his monster, that story of horror and hubris has become one of the world’s most recognizable narratives. It also, these days, stars one of the world’s most recognizable characters. The monster is a Halloween mainstay, and the modern version of his likeness — with his green-tinged and seamed skin — is instantly recognizable.

That recognition is the product of a steady visual evolution, as explored in the forthcoming book Frankenstein: The First Two Hundred Years by Christopher Frayling. But it’s also the product of a very specific moment in history, in which the educated elite class to which Shelley belonged would have understood the idea of reanimating a jumble of human parts had serious scientific backing.

Frankenstein
Courtesy of Reel Art Press

The idea of a human being as merely a mechanical assortment of bones and muscles has been explored since the 18th century by scientists and philosophers, and plays and stories of the time reflect the fascination with the idea. William Godwin, Mary’s father, had exposed her to cutting-edge science from her childhood on — at a time when many were captivated by the mysterious role of electricity in nature, and the record shows that she attended scientific demonstrations. And, as Frayling notes, when Percy Shelley was a student at Oxford, he had even tried to bring a cat back to life.

During the summer of 1816, when Mary, Percy and their friends (including Lord Byron) gathered near Geneva and challenged each other to tell ghost stories, that science would have also been a frequent topic of discussion. As Frayling writes:

While Mary was perhaps not an active participant in those conversations, it’s not hard to see that the subject wormed its way into her mind.

And, processed through her remarkable imagination, it emerged as Frankenstein. Though the electrical science that fascinated Shelley is no longer current, her story has meant the questions of that age are still alive — or at least as alive as a reanimated monster can be.

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Write to Lily Rothman at lily.rothman@time.com.

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