Which revolutionary visual merchandising approach, first introduced in the 1970s, transformed bookstore layouts and is credited with significantly increasing book discovery and sales?

In the competitive world of book retail, visual merchandising has evolved into a sophisticated art form. Independent bookstores and major chains alike use creative display techniques to entice readers and showcase literature. This trivia question explores one of the most influential innovations in bookstore merchandising that revolutionized how readers discover and interact with books in physical retail spaces.

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Face-out book displays (showing covers instead of just spines)
Thematic book bundling (grouping books by subject rather than alphabetically)
The 'staff picks' highlighted recommendation system
Interactive reading nooks with sample chapters available