Which innovative book packaging format from the early 20th century dramatically increased literature accessibility and is credited with democratizing reading culture?

Book packaging is a fascinating blend of art and marketing strategy. Publishers carefully craft covers to attract readers while conveying the essence of the literary work. This poll tests your knowledge about how visual storytelling in book packaging has influenced literary success throughout history. Can you identify which famous packaging innovation revolutionized the accessibility of classic literature to the masses?

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Penguin's color-coded paperbacks (1935), which made classic literature affordable through standardized design and mass production
Folio Society's leather-bound collector editions, which elevated books to luxury status through craftsmanship
Random House's 'Modern Library' hardcovers, which introduced dust jackets as protective covers for premium editions
Doubleday's 'Literary Guild' subscription model, which packaged books with companion reading guides and author interviews