By Sam Vaknin
Author of "Malignant Self-love: Narcissism Revisited"
Consider these conundrums:
1. A brilliant geek invents a 3D printer which replicates flawlessly the Mona Lisa. Leonardo’s masterpiece and the copy spewed out by the machine are indistinguishable even under an electron microscope: they cannot be told apart. In which sense, therefore, is the artist’s Mona Lisa superior to or different from its identical clone?
2. An ancient letter unearthed in the archives of...