Which innovative book packaging design, first popularized in the 1930s, revolutionized children's literature by allowing young readers to physically interact with the story?

The publishing industry has seen numerous packaging innovations that have revolutionized how we experience literature. From dust jackets to limited edition covers, the packaging of books has become an art form in itself. This trivia question explores a groundbreaking packaging design that transformed how we interact with certain literary works.

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Pop-up books with three-dimensional paper engineering
Glow-in-the-dark cover illustrations
Velvet-textured book jackets
Transparent overlay pages showing anatomical systems