Which publishing innovation, introduced in the 1930s, revolutionized book marketing by making books more accessible and recognizable to the average consumer?

In the competitive world of publishing, book cover design serves as both art and advertising. A compelling cover can significantly impact a book's commercial success, with studies showing that readers make purchase decisions within seconds based on cover appeal. This poll tests your knowledge about a revolutionary book cover design strategy that transformed the publishing industry's marketing approach.

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The Penguin Books color-coded cover system (orange for fiction, blue for biography, etc.)
Random House's embossed hardcover designs with gold lettering
Harper Collins' illustrated dust jacket series
Simon & Schuster's author photograph portrait covers