Which innovative packaging format revolutionized children's literature in the 1980s, creating a multi-billion dollar publishing phenomenon?

The publishing industry has evolved dramatically in how books are packaged and presented to readers. From dust jackets to special editions, the physical presentation of literature has been crucial to marketing success. This trivia question explores an innovative packaging trend that revolutionized a segment of the literary market and created new opportunities for reader engagement.

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Pop-up books with 3D paper engineering
Choose Your Own Adventure books with branching storylines
Book and cassette tape combination packages
Scratch-and-sniff storybooks with scented pages