Which product design innovation in the publishing industry is credited with allowing readers to easily access non-linear content and revolutionized reference materials in the 13th century?

Throughout history, the physical design of books has evolved dramatically, influencing how we interact with literature. From scrolls to codices to e-readers, the product design of books reflects changing technology, reader preferences, and cultural values. This trivia question explores a fascinating innovation in book design that revolutionized how readers interacted with literature and created new possibilities for storytelling and information access.

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The addition of page numbers and indices
The introduction of paperback bindings
The implementation of chapter divisions
The development of illustrated frontispieces