Which innovative book cover technology was first used for the 2012 limited edition of Ray Bradbury's 'Fahrenheit 451' to emphasize the book's themes?

The art of book cover design has evolved dramatically in the digital age. Publishers are constantly seeking innovative product packaging solutions to make physical books stand out in an increasingly digital world. From thermochromic ink that changes with touch to augmented reality features that bring covers to life, product innovation in publishing has entered fascinating new territory. Test your knowledge about cutting-edge book cover design technologies that are reshaping how we experience literature.

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

Heat-sensitive ink that reveals hidden text when warmed (matching the book's theme of burning books)
LED-embedded cover that illuminates key imagery when opened
Augmented reality markers that display digital flames when viewed through a smartphone app
Sound chip technology that plays crackling fire sounds when the book is opened