Which packaging innovation for religious texts was first introduced in the 4th century CE and revolutionized how sacred writings were accessed?

Throughout history, religious texts have been packaged and presented in ways that reflect their sacred status. From ancient scrolls to modern digital formats, the packaging of religious texts has evolved while maintaining reverence for the content. This poll tests your knowledge about the historical packaging innovations that have shaped how we interact with spiritual wisdom across different faith traditions.

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The codex format (bound book with separate pages)
The illuminated manuscript with gold leaf embellishments
The portable pocket-sized prayer book
The sealed clay vessel containment system