Which packaging innovation for religious texts emerged in the 4th century CE and revolutionized how people interacted with sacred writings?

Throughout history, religious texts have undergone fascinating transformations in their physical packaging and presentation. From ancient scrolls to modern digital formats, the way sacred writings are packaged reveals much about cultural values, technological capabilities, and religious practices. This trivia question explores how packaging design for religious texts has evolved and what this reveals about the intersection of faith, commerce, and consumer engagement with sacred materials.

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The codex (book format with bound pages), replacing scrolls
Illuminated manuscripts with gold leaf decoration
Portable pocket-sized prayer books with leather covers
Multilingual parallel text editions with translation notes