Which innovative book packaging technique, introduced in the early 2000s, revolutionized children's literature by incorporating physical objects inside the book cover that readers could interact with?

The publishing industry has seen remarkable innovations in book packaging over the years, from traditional hardcovers to modern designs that enhance the reader's experience. These innovations have not only protected books during shipping but have also become part of the literary experience itself. This trivia question explores a groundbreaking packaging innovation that changed how certain literary works are presented and consumed.

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Augmented Reality (AR) covers that come alive when viewed through a smartphone app
Interactive paper engineering with embedded tactile elements
Scented pages that release relevant aromas as readers progress through the story
Sound chip technology that plays ambient music matching the story's mood