Giorgio Vasari in the "Life of Michelangelo" wrote: "Michelangelo finished the Moses in marble, a statue of five braccia, unequaled by any modern or ancient work.Seated in a serious attitude, he rests with one arm on the tablets, and with the other holds his long glossy beard, the hairs, so difficult to render in sculpture, being so soft and downy that it seems as if the iron chisel must have ... More @Wikipedia
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