Which innovative packaging design approach led to a 200% sales increase for classic literature titles when implemented by Penguin Random House in 2018?

The book publishing industry has seen remarkable packaging innovations that have transformed how readers engage with literature. From special edition covers to interactive elements, packaging design in publishing creates meaningful connections between authors and readers. This poll tests your knowledge about a groundbreaking packaging design innovation that significantly impacted book sales and reader engagement in recent years.

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Thermochromic covers that change color when touched, revealing hidden artwork related to the book's themes
Edible book jackets made from rice paper with flavors matching key elements in the story
3D-printed miniature dioramas of pivotal scenes that attach to the book spine
Augmented reality covers that animate when viewed through a smartphone app