Which book packaging innovation, introduced in 1935 by Penguin Books, revolutionized reading culture by making quality literature more affordable and accessible to the general public?

Product packaging in the publishing industry has evolved dramatically over the centuries, influencing how we perceive, purchase, and preserve literature. From ancient scrolls to modern e-readers, the 'packaging' of written works reflects technological advancement, artistic trends, and marketing strategies. This trivia question focuses on a revolutionary packaging innovation that transformed the accessibility and popularity of literature in the 20th century.

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Mass-market paperbacks with standardized design and low price points
Leather-bound collector's editions with gold leaf detailing
Hardcover books with removable dust jackets featuring artwork
Subscription-based book series with matching spine designs