Which innovative book packaging trend has gained popularity in the publishing industry since 2018, leading to increased sales particularly among younger readers?

Book cover design is a fascinating blend of art, marketing, and storytelling. A well-designed cover can significantly impact a book's commercial success, with studies showing that readers make purchasing decisions within seconds based on cover appeal. This trivia question explores an innovative trend in literary product packaging that has reshaped how certain books are presented to consumers in recent years.

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Sprayed edges (colored page edges that create patterns or images when the book is closed)
Augmented reality covers (covers that animate when viewed through smartphone apps)
Reversible dust jackets (two different cover designs on the inside and outside)
Scented covers (book covers infused with fragrances related to the story)