Which innovative packaging design concept, introduced in the early 2000s, is credited with revitalizing classic literature sales by making books more portable and accessible to modern readers?

In the publishing world, book design and packaging can dramatically impact sales and reader engagement. One revolutionary packaging innovation changed how readers interact with certain literary works, creating an entirely new reading experience and boosting sales for previously underperforming classics. Test your knowledge of this significant packaging design breakthrough in the literary marketplace.

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Penguin's flip-top paperback design with built-in bookmark ribbons
Barnes & Noble's leather-bound collector's editions with gold leaf pages
Penguin Mini editions with horizontal page orientation and ultra-compact sizing
Amazon's glow-in-the-dark cover series for horror classics