They also literally can't do anything but show you books, no notifications or anything. Just you and the book.
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But something in your brain works differently when a display doesn't update (e-ink) or updates 24-120 times per second ("normal" display).
Combine that with e-ink lights being a subtle warm glow vs. phone/tablets having MAXIMUM BRIGHTNESS shining at your face...
They also literally can't do anything but show you books, no notifications or anything. Just you and the book.