Which innovative packaging design technique revolutionized the young adult fiction market in 2019 by incorporating augmented reality elements into book covers?

In the competitive world of publishing and bookselling, packaging design has become increasingly important for attracting readers. From special edition covers to innovative book boxes and subscription services, the way literature is presented physically has evolved dramatically. This poll tests your knowledge about a recent packaging innovation that changed how certain literary works are marketed and consumed.

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Thermochromic Ink Covers that reveal hidden artwork when touched
AR BookPortals by Penguin Random House, allowing readers to scan covers to see character animations
Soundtrack-embedded book jackets with built-in audio chips
Illuminated LED edge technology that lights up specific quotes when the book is opened