Abstract
If the Mona Lisa, the Sistine Chapel, the sarcophagus of Tutankhamun, or the Sword of Goujian were destroyed, nothing could replace them. New works of art that are even more impressive may be created, which may replenish the value in the world in quantity, but they would not fully replace the loss. Works of art and historical artifacts have irreplaceable value. But just what is irreplaceable value? This paper presents perhaps the first analysis. Irreplaceable value is a matter of intrinsic value in virtue of unreinstantiable good-making properties, which give rise to reasons to preserve and protect.