Excerpt from Applied Perspective: For Architects and Painters
As we look out over sea or plain the earth seems to end in the Sharp level line which we call the horizon. This horizon is in appearance just at the level of our eyes, and always remains so. It is a commonly noted phenomenon that, being on a level with our eyes, it rises with us. If we go to the house-top or to the masthead, it is still at our level. People who go up in balloons say that this appearance is so marked that the land or sea beneath them looks like a saucer, the middle being visible far below them, while the edges look as high as themselves. When we see the whole horizon we see a circle or hoop about us, but it is a circle or hoop seen from the centre, of which only a small part is seen or considered at once, and way part of it looks like a straight line.
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