A ring is an unending circle, a symbol of completeness and wards from outside predators. That is why primitive dance often used the circle formation, because it was thought to be the most powerful. This is why i believe that Sauron chose a ring, and that he wore it was even more symbolic of his power, it became him and he became it. And besides, a crown would probebly fall off, but the only way to remove a ring is to take it off.
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