Which packaging design innovation, first popularized in the 1930s, revolutionized the book publishing industry by making literature more accessible and portable?

Packaging design in publishing has evolved dramatically over the decades, with book covers serving as crucial marketing tools in the literary world. Beyond simply protecting pages, modern covers must capture the essence of a story, attract the right audience, and stand out in both physical and digital marketplaces. This trivia tests your knowledge about a significant packaging design innovation that transformed how readers interact with literature.

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Mass-market paperbacks (pocket books)
Dust jackets with flap copy
Embossed hardcover designs
Interactive flip covers