Which innovative book packaging format, introduced in the 1930s by Penguin Books, revolutionized the publishing industry by making literature more affordable and accessible to the general public?

The publishing industry has undergone numerous transformations in how books are presented to consumers. Book packaging has evolved significantly over centuries, from leather-bound tomes to modern innovative designs that capture readers' attention in increasingly competitive retail environments. This trivia question explores a pivotal moment in book packaging history that changed how readers interact with literature.

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Mass-market paperbacks with standardized colored covers
Leather-bound collector's editions with gold leaf detailing
Hardcover books with removable dust jackets
Spiral-bound editions with waterproof covers