Which publishing innovation of the 1930s revolutionized book packaging by introducing inexpensive, lightweight paperbacks with eye-catching covers, making literature more accessible to the masses?

The art of book packaging has evolved dramatically over centuries, from simple leather bindings to elaborate dust jackets and digital covers. Beyond mere protection, book packaging has become a crucial marketing tool and art form in itself. This trivia explores a groundbreaking innovation in book packaging that revolutionized the accessibility of literature and helped create what we now know as 'mass market' books. Test your knowledge of this important development in publishing history!

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Penguin Books' standardized paperback format created by Allen Lane
Random House's 'Modern Library' series with cloth hardcovers
Doubleday's 'Book-of-the-Month Club' subscription model
Harper's 'Illuminated Bible' with decorative engravings