Which innovative book packaging design, introduced in the 1930s, revolutionized the paperback market with its distinctive colorful covers and uniform spine design?

The publishing industry has seen many innovations in how books are presented to consumers. From dust jackets to special editions, the packaging of literature has evolved dramatically over the centuries. This poll tests your knowledge of a groundbreaking moment in book packaging design that revolutionized an entire segment of the literary market and influenced how readers interact with certain types of books.

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Penguin Books' color-coded covers (orange for fiction, green for crime, blue for biographies)
Harlequin's romance novel covers with embossed titles and dramatic character illustrations
Dell's mapback design featuring detailed crime scene maps on the back covers
Random House's Art Deco dust jackets with gold foil accents