E-Ink

So I turn off my kindle. Don't wanna run down the battery, eh? Then I look at it later and there's a picture on the screen. So I turn it off ag'in. Later, there's an image on the screen ... a different one, like this guy: Then I read that a still image doesn't draw any power. Huh? Then I read that the kindle has e-ink. E-who? You apply a static charge to some electrodes. The polarity changes from point to point. You got yourself a collection of pixels (in shades of grey). You turn off the power ... and the charged black & white particles stay put. Just like the images I'd scratch on the walls of our cave ... when I was young. So ... what's next? Mamma mia!