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Where sky and sea meet

In the windless zone near the equator, the sea is an azure surface with only a few wispy clouds floating above it, and the blue sky encompasses the surface. Thus, the blue horizon, where sky and sea meet, is clearly the sky above and the sea below. You can only guess, but you can't tell, and you see no reason to. On the blue horizon, where the sky and the sea blend together and it's hard to tell the difference, the visual elements that we rely on are useless, and we can only barely accept the boundary through the process of sensing light itself. In this way, the …