Which innovative packaging design from the 1930s revolutionized the book industry by making literature more accessible and affordable to the masses?

The publishing industry has long understood the power of book packaging and design to attract readers. Throughout literary history, certain packaging innovations have revolutionized how we interact with books and other printed materials. This trivia question explores a significant packaging innovation that transformed the literary marketplace and reader experience. Test your knowledge about how the physical presentation of literature has evolved!

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Penguin Books' standardized paperback format with color-coded covers
Dust jackets with die-cut windows revealing cover art
Book-of-the-Month Club's subscription box packaging
Foil-stamped hardcover bindings with embossed author signatures