Which innovative packaging design technique revolutionized children's publishing in the 1960s and remains influential today?

The book publishing industry has evolved significantly in how it packages and presents literature to consumers. From classic dust jackets to innovative special editions, packaging design plays a crucial role in attracting readers and conveying a book's essence. This poll tests your knowledge about a groundbreaking packaging innovation that changed how we experience certain literary works.

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Pop-up book technology developed by Waldo Hunt that created three-dimensional paper engineering
Glow-in-the-dark ink covers pioneered by Random House for bedtime story collections
Interchangeable book covers system created by Penguin to customize appearance
Water-resistant page coating developed by HarperCollins for bath-time reading