Which innovative book packaging trend emerged in the 2010s that specifically encourages social media sharing among readers?

Book cover design is a crucial intersection of art and marketing in the publishing industry. Over the decades, cover design has evolved from simple protective coverings to sophisticated marketing tools that can make or break a book's commercial success. This trivia question explores an innovative packaging trend that has significantly impacted how readers interact with literary works in the physical retail space.

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Reversible dust jackets with alternate cover designs
Instagram-optimized 'shelfie-ready' cover designs with high-contrast colors and minimal text
Textured covers with embedded scent technology to enhance the reading experience
Holographic cover illustrations that change perspective when viewed from different angles