Which book packaging innovation from the early 20th century revolutionized the publishing industry by making literature more affordable and accessible to the masses?

Throughout history, book covers and packaging have played a crucial role in literature's commercial success. From dust jackets to modern designs, publishers have used innovative packaging to attract readers and convey the essence of literary works. This poll tests your knowledge of iconic book packaging that transformed publishing and created lasting cultural impressions. Can you identify which famous packaging innovation revolutionized the accessibility of literature?

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Penguin Books' color-coded paperback covers (orange for fiction, green for crime, etc.)
Random House's first hardcover book club subscription boxes
Harper's leather-bound collector's editions with gold leaf
Scribner's illustrated dust jackets for first editions