Which publishing innovation of the 1930s revolutionized book marketing by introducing colorful, illustrated covers to previously plain books, creating the modern 'paperback revolution'?

Book covers are crucial marketing tools in publishing, serving as visual ambassadors that can make or break a book's success. The art of book cover design blends visual storytelling with retail marketing principles to entice readers. This poll tests your knowledge about a famous historical shift in book cover design that revolutionized how literature was marketed to consumers and ultimately changed the publishing industry's approach to visual packaging.

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Penguin Books' color-coded cover system
Random House's 'Modern Library' jackets
Harper & Brothers' 'Illuminated Covers' series
Scribner's 'Golden Age' dust jacket designs