Which packaging innovation for books was first introduced in the 1930s and revolutionized the paperback market by making books more affordable and accessible to the general public?

In the publishing world, book packaging has evolved significantly over the decades. From simple cloth covers to elaborate dust jackets and innovative designs, the way books are presented to consumers has become an art form in itself. This poll tests your knowledge about a groundbreaking packaging innovation that changed how readers interact with literary works. Think about famous packaging designs that transformed the reading experience!

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Penguin's color-coded covers system (orange for fiction, green for crime, etc.)
Foil-stamped dust jackets with embossing
Acetate protective book covers
French flaps on paperback editions