July 10, 2017 at 11:24 AM EDT

The humble origin of Harry Potter is common knowledge amongst the majority of Hogwarts enthusiasts: Once upon a time, author J.K. Rowling crafted her magical realm onto a series of, none other than, napkins.

But in a recent interview with CNN’s Christiane Amanpour, Rowling revealed that writing her stories on objects not typically used for writing, nor reading, wasn’t just a one-off. In celebration of her 50th birthday, Rowling wrote a lost fairy tale on the dress she decided to wear for the occasion.

“The theme of my 50th birthday, which I held at Halloween, even though that’s not really my birthday, was come as your own private nightmare,” Rowling, who turns 52 this year, said. “And I went as a lost manuscript. And I wrote over a dress most of that book. So that book, I don’t know whether it will ever be published, but it’s actually hanging in a wardrobe currently.”

Rowling’s actual birthday is the same as The Boy Who Lived: July 31. Harry Potter and the Sorcerer’s Stone (Philosopher’s Stone in the U.K.) recently celebrated its 20th anniversary.

The CNN interview airs Monday.

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