Portal:History of science/Article/2
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The Great Chain of Being is a classical and western medieval conception of the order of the universe, whose chief characteristic is a strict hierarchal system.
It is a conception of the world's structure that was accepted, and unquestioned, by most educated men from the time of Lucretius until the Copernican revolution and the ultimate flowering of the Renaissance. The Chain of Being is composed of a great number of hierarchal links, from the most base and foundational elements up to the very highest perfection - in other words, God, or the Prime Mover.
Moving on up the chain, each succeeding link contains the positive attributes of the previous link, and adds (at least) one other. Rocks possess only existence; the next link up, plants, possess life and existence. Beasts add not only motion, but appetite as well. Man is a special instance in this conception. He is both mortal flesh, as those below him, and also spirit, like the angels and God above.
The Great Chain of Being was central to work in natural history before the time of Linnaeus and Buffon.
