Which innovative product design feature, first widely implemented by Amazon's Kindle in 2007, revolutionized the publishing industry by allowing readers to adjust text display?

The publishing industry has undergone massive transformation with digital product design innovations. From traditional printed books to interactive e-readers and audiobook platforms, technology has revolutionized how literature is consumed. This trivia question explores a pivotal moment in literary product design that changed reading habits worldwide. Test your knowledge about this significant shift in arts and literature product development!

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E-ink technology that mimics the appearance of paper and reduces eye strain
Backlit LED screens with automatic brightness adjustment based on ambient light
Voice recognition software allowing hands-free page turning
Motion-sensing page turning activated by tilting the device