Which innovative book packaging technique was first popularized in the 1930s and revolutionized children's literature by allowing physical interaction with the narrative?

The publishing world has seen remarkable innovations in how books are packaged and presented to readers. From dust jackets to interactive elements, the physical presentation of literature has evolved dramatically over the centuries. This trivia question explores a groundbreaking packaging innovation that changed how readers interact with certain literary works. Test your knowledge about the intersection of product design and literature!

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Pop-up books with three-dimensional paper engineering
Choose-your-own-adventure branching narrative formats
Heat-sensitive ink that reveals hidden text when touched
Audiobook accompaniments on vinyl records