Which packaging innovation revolutionized children's literature in the 1960s, allowing readers to actively participate in the storytelling experience?

The publishing industry has continuously evolved its approach to book packaging and presentation. From dust jackets to interactive covers, packaging innovations have played a crucial role in marketing literature to readers. This poll tests your knowledge about a revolutionary packaging innovation that changed how readers interact with certain literary works.

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Pop-up books with three-dimensional paper engineering
Scratch-and-sniff book covers that released scents related to the story
Glow-in-the-dark cover illustrations for bedtime stories
Heat-sensitive pages that revealed hidden text when touched