Which innovative book packaging technique was first introduced by Penguin Books in the 1930s that revolutionized the accessibility of literature?

The publishing industry has long used innovative packaging to attract readers and collectors. From elaborately bound classics to modern special editions with unique features, book packaging has evolved into an art form of its own. This trivia challenges you to identify a groundbreaking packaging innovation that changed how we experience literature. Test your knowledge of where book design meets marketing innovation!

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

Mass-market paperbacks with standardized colored covers (orange for fiction, blue for biography, etc.)
Dust jackets with embossed lettering and author photographs
Transparent plastic book covers with embedded LED lights
Leather-bound collectors' editions with gold-leaf page edges