I remember one of those "books." As I recall, they could be particularly hard on the eyes. I saw one once, where the text on the leaves was printed from some vegetable-based solution, but it had not been done very well. The markings alternated from strong to faint, and often from reasonable clear to blurry and irregular. You could not adjust the brightness, contrast or focus at all. And if you held it under the wrong light, you couldn't make out the text on one side against the text on the other side (and why anyone would imprint text on two sides of a see-through display is still beyond me).
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