Which product design innovation, introduced by Penguin Books in 1935, revolutionized the publishing industry by making quality literature more affordable and recognizable?

Test your knowledge about iconic product designs in the world of literature and publishing! The publishing industry has seen remarkable innovations in how books are designed, presented, and marketed to readers. From classic cover designs that defined literary eras to innovative book formats that changed how we interact with literature, product design plays a crucial role in how we experience written works. Can you identify this groundbreaking product design innovation that transformed the literary marketplace?

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The paperback book with standardized cover design and color-coding by genre
The leather-bound collector's edition with gold-embossed author signatures
The illustrated dust jacket with plot summary and author biography
The spiral-bound manuscript format with detachable pages for editing