Which innovative product design feature did Amazon first introduce in its original Kindle e-reader that revolutionized the reading experience?

The intersection of literature and product design has created some fascinating innovations in how we consume written content. From the evolution of bookstores to innovative reading devices, the art of reading has been transformed through thoughtful product design. Test your knowledge about how product design has shaped our literary experiences and changed how we interact with books and written content in the modern age.

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E-ink technology that mimics the appearance of paper and reduces eye strain
Text-to-speech capabilities that read books aloud
Waterproof casing for reading in the bath or by the pool
Color display technology for illustrated books and magazines