Which innovative book packaging technique first emerged in the 2010s and allows readers to interact with a book's cover using their smartphone?

Book packaging design has evolved dramatically over centuries, from simple leather bindings to today's interactive covers with QR codes, augmented reality features, and innovative materials. Publishers now use packaging not just to protect books but as powerful marketing tools that communicate genre, tone, and brand identity. Test your knowledge about this fascinating intersection of literature and design innovation!

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Thermochromic ink covers that change color with temperature
Augmented reality (AR) covers that display animations when viewed through an app
Embedded LED light displays powered by thin batteries
Scent-infused covers that release fragrances related to the book's content