When Penguin Books launched in 1935, what groundbreaking product development strategy did they introduce that revolutionized the publishing industry?

In the publishing world, some brands have become as iconic as the books they produce. One publisher transformed the landscape of affordable literature with a revolutionary approach to brand identity and product design. Their strategy not only democratized literature but created one of the most recognizable logos in publishing history. Test your knowledge about this landmark of literary brand development!

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Color-coded book covers by genre (orange for fiction, green for crime, etc.)
First publisher to use recycled paper for mass market books
Introduction of author photographs on all book covers
First to sell books through subscription-based monthly clubs