Which product design innovation in religious text packaging had the most significant impact on making religious texts accessible to ordinary believers during the Medieval period?

Throughout history, the packaging and presentation of religious texts have evolved significantly, reflecting both technological advancements and cultural values. From ancient scrolls to modern digital formats, the way sacred writings are presented affects how they're perceived, distributed, and used by followers. This trivia question explores an interesting innovation in religious text packaging that created a significant shift in accessibility and practice. Test your knowledge about the intersection of product design and religious text presentation!

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The codex format (bound book) replacing scrolls
Gold-leaf illuminated manuscripts
Portable pocket-sized prayer books
Multilingual parallel text editions