Which innovative packaging approach has recently transformed the accessibility of religious texts in developing countries?

Throughout history, religious texts have been packaged and presented in various ways that reflect both their sacred nature and the technological capabilities of their time. From ancient scrolls to modern digital formats, the packaging of spiritual wisdom has evolved significantly. This trivia question explores an interesting innovation in how religious texts are packaged and presented to modern spiritual seekers.

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Solar-powered audio Bible devices that can be recharged indefinitely in areas without electricity
Scripture printed on biodegradable seed paper that can be planted after reading
Holographic scripture displays that require no power source to maintain their image
Religious texts printed with temperature-sensitive ink that reveals additional commentary when touched