Which packaging innovation for religious texts was first introduced in the 4th century CE, revolutionizing how people accessed and studied scripture?

Throughout history, religious texts have undergone fascinating transformations in their physical presentation to meet the needs of different communities. From ancient scrolls to modern digital formats, the packaging and presentation of sacred texts reflect both technological advancement and cultural preferences. This trivia question explores an innovative packaging development in religious publishing that changed how people engage with scripture.

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The codex format (bound pages) replacing scrolls
Red-letter editions highlighting divine speech
Parallel column translations for comparative study
Thumb indexes for quick reference to books