Which publishing innovation is credited with creating the modern 'paperback revolution' in the 1930s, making books more affordable and accessible through distinctive orange covers and standardized design?

In the world of books and literature, packaging design plays a crucial role in attracting readers and conveying the essence of the content within. Throughout publishing history, certain innovations in book cover design and packaging have revolutionized how we interact with literary works. This trivia tests your knowledge of significant packaging design milestones in the literary world that transformed books from mere text containers into artistic objects of desire.

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Penguin Books' uniform color-coded system
Oxford University Press's World's Classics series
Random House's Modern Library editions
Faber and Faber's typographic covers