Which packaging innovation, first widely adopted in the 1930s, revolutionized the paperback book market by making books more affordable and accessible to the mass market?

The publishing industry has continuously evolved its packaging strategies to attract readers and stand out in bookstores. From dust jackets to embossed covers, publishers have employed numerous design innovations throughout history. This poll tests your knowledge about a revolutionary packaging design technique that transformed the book market in the early 20th century and remains influential today.

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Penguin Books' standardized color-coded covers and uniform typography
Foil-stamped dust jackets with embossed lettering
Leather-bound books with marbled endpapers
Hardcover books with removable plastic protective covers