"But...books are so much more. Some of them are webs; you can feel your way along their threads, but just barely, into strange and dark corners. Some of them are balloons bobbing up through the sky: totally self-contained, and unreachable, but beautiful to watch. And some of them―the best ones―are doors."

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It has always irked me as improper that there are still so many people for whom the sky is no more than a mass of random points of light. I do not see why we should recognize a house, a tree, or a flower here below and not, for example, the red Arcturus up there in the heavens as it hangs from its constellation Bootes, like a basket hanging from a balloon.

— M. C. Escher