Which paperback publishing innovation of the 1930s revolutionized book packaging and accessibility by introducing colorful, eye-catching covers and making quality literature available at affordable prices?

The way books are packaged and presented has evolved dramatically over centuries, influencing how we interact with literature. From medieval illuminated manuscripts to modern dust jackets and e-book covers, packaging design in publishing has shaped the reading experience and book marketing. This trivia question focuses on a pivotal innovation in book packaging that revolutionized the accessibility and popularity of literature in the 20th century.

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Penguin Books' uniformly designed paperbacks with color-coded genres
Random House's 'Modern Library' series with embossed leather covers
Harper & Brothers' 'Harper Torchbooks' with transparent dust jackets
Scribner's 'Author's Edition' with personalized author signatures on covers