Which packaging innovation in the literary world led to a 200% increase in audiobook consumption between 2015-2020?

In the publishing industry, packaging design has evolved dramatically over the decades, influencing reader choices and book sales. From minimalist covers to elaborate dust jackets with foil stamping and embossing, publishers invest heavily in visual appeal. This poll tests your knowledge about a significant packaging innovation that changed how readers interact with certain literary products. Can you identify which packaging innovation truly revolutionized a segment of the literary market?

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Single-download digital audiobook packaging replacing multi-CD sets
Hardcover books with built-in QR codes linking to author interviews
Eco-friendly biodegradable packaging for book subscription boxes
Color-changing book covers that respond to temperature changes