Which packaging innovation in the 4th century CE revolutionized access to religious texts and replaced scrolls as the primary format for Christian scriptures?

Throughout history, the packaging and presentation of religious texts has evolved significantly, reflecting both technological advancements and cultural shifts. From ancient scrolls to modern digital formats, the way religious wisdom is contained and presented affects how it's perceived and valued. This poll explores a fascinating aspect of religious product design history that transformed accessibility to sacred texts across different faith traditions.

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The codex (bound book format)
Illuminated manuscripts with gold leaf
Papyrus folios in wooden cases
Wax tablets with leather binding