Which publishing innovation of the 1930s revolutionized book packaging and made literature more accessible to the masses?

The way books are packaged and presented has evolved dramatically over centuries, often reflecting artistic movements and technological innovations of their time. Book cover design is both an art form and a marketing tool that can significantly impact a book's reception and sales. From ornate Victorian bindings to minimalist modern designs, packaging in literature has its own fascinating history. Test your knowledge about a revolutionary moment in book packaging design that changed how we interact with literature.

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Penguin's standardized paperback format with color-coded covers
Random House's introduction of dust jackets with artwork
Simon & Schuster's invention of the hardcover book club edition
Oxford University Press's leather-bound pocket classics