Which product design innovation revolutionized the accessibility of religious texts in the 16th century and is often credited with helping spark the Protestant Reformation?

Religious architecture and product design have always been intertwined, creating spaces and objects that facilitate spiritual practice. From ancient temples to modern meditation apps, the 'business' of faith has continuously evolved. This poll tests your knowledge about the product design aspects of religious items and spaces that serve both practical and spiritual purposes across different faith traditions.

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Gutenberg's printing press with movable type
Illuminated manuscripts with gold leaf decoration
The codex format replacing scrolls
Mass-produced prayer beads and rosaries