Which innovative product packaging approach for religious texts was first introduced in the 4th century CE, revolutionizing accessibility and reading experience?

Throughout history, religious texts have not just been containers of spiritual wisdom, but products with distinct packaging, presentation, and consumer experiences. From scrolls to digital apps, the way sacred writings are packaged and presented has evolved dramatically to meet changing needs while preserving tradition. This poll explores how religious text presentation has adapted to shifting consumer preferences while maintaining spiritual integrity.

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The codex format (bound book with pages), replacing scrolls
Illuminated manuscripts with gold leaf illustrations
Parallel translation columns for multiple languages
Color-coding systems for different types of religious content