Which packaging innovation, introduced in 1935, revolutionized book accessibility and is credited with helping literature reach mass audiences during the Great Depression?

In the world of literature and publishing, packaging innovations have dramatically influenced how books are marketed and consumed. From dust jackets to special editions, the physical presentation of literature has evolved significantly over the decades. This trivia question explores a revolutionary packaging innovation that transformed book marketing and accessibility in the mid-20th century. Test your knowledge about the intersection of literary history and product packaging!

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Penguin's color-coded paperback covers
Limited edition cloth-bound box sets
Dust jackets with author photographs
Transparent cellophane book wrapping