Which innovative packaging/design feature was first introduced for mass-produced Bibles in the 20th century specifically to increase readability and usage?

Throughout history, religious texts have not just been about content but also presentation. The packaging and design of sacred books have evolved significantly, reflecting both theological priorities and product marketing considerations. This trivia question explores how one major religion adapted its text presentation to meet modern needs while preserving tradition. Test your knowledge about the intersection of religious product development and marketing!

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Red letter edition (printing Jesus's words in red)
Leather-bound covers with gold leaf edging
Illuminated manuscript styling with decorative borders
Concordance and cross-reference systems