I'd also add that ever since I figured this out I've wanted to invent an ebook reader that actually gave you a third dimension, multiple (say ~20) eink pages wi

I'd also add that ever since I figured this out I've wanted to invent an ebook reader that actually gave you a third dimension, multiple (say ~20) eink pages with perhaps an additional tactile slider on the binding as you progress through the book. Maybe it'll become feasible as the price for flexible eink displays drops.