Which product design innovation is credited with making books widely accessible to the general public for the first time in the 15th century?

The publishing industry has evolved dramatically over centuries, with numerous innovations in product design that transformed how we interact with books and literature. From ancient scrolls to modern e-readers, the physical design of literary products has shaped our reading experience. This trivia question focuses on a pivotal moment in book design history that revolutionized accessibility and popularization of literature.

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• Gutenberg's movable type printing press
• The introduction of paperback books by Penguin Publishing
• The codex format replacing scrolls
• Mass-produced leather-bound volumes with gold leaf

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