Which packaging innovation, introduced by Penguin Books in 1935, revolutionized the publishing industry by making quality literature more affordable and accessible to the mass market?

Book packaging and design has evolved dramatically over centuries, often reflecting both artistic movements and commercial innovation. From illuminated manuscripts to dust jackets, audiobooks to e-readers, the 'container' for literature has undergone remarkable transformations. This trivia tests your knowledge about a significant packaging innovation that revolutionized access to literature and changed reading habits worldwide. Consider how packaging decisions impact not just aesthetics but democratization of knowledge.

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Standardized paperback format with uniform design and color-coding by genre
Leather-bound collector's editions with gold-leaf embossing
The first dust jackets with promotional text and author photos
Illustrated book covers commissioned from famous artists