Which innovation in the 1930s publishing industry revolutionized book cover design and marketing by introducing standardized, colorful paperback covers aimed at mass-market appeal?

Book covers are more than just protection for pages—they're powerful marketing tools that have evolved dramatically over centuries. From simple leather bindings to today's algorithm-influenced designs, cover art represents the intersection of literature, visual arts, and product design. This trivia explores a fascinating turning point in publishing history that changed how readers interact with books as consumer products.

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Penguin Books' color-coded genre system and minimalist design
Random House's illustrated dust jackets with embossed titles
Harper Collins' photographic cover art with metallic ink printing
Simon & Schuster's 'Living Author' series with portrait-based covers