Which famous book series revolutionized children's book packaging with its dual cover designs - one 'adult' version and one illustrated 'children's' version - leading many publishers to adopt this strategy?

The art of book packaging has evolved dramatically over centuries, from ornate leather-bound volumes to eye-catching modern designs that can make or break a book's success. Publishers know that a book's cover is its first ambassador, often determining whether a potential reader picks it up. This poll tests your knowledge about one of the most iconic book cover designs in literary history that revolutionized how books were marketed and perceived by readers.

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Harry Potter series by J.K. Rowling
The Chronicles of Narnia by C.S. Lewis
His Dark Materials by Philip Pullman
A Series of Unfortunate Events by Lemony Snicket