EDITOR’S NOTE:   Curio is a CNN Style series spotlighting small objects and the big ideas behind them. Taipei, Taiwan  —  The Louvre’s “Mona Lisa,” the British Museum’s Rosetta Stone, MoMA’s “Starry Night” — major museums often have one must-see item that singlehandedly draws visitors from around the world. For the National Palace Museum, in Taiwan’s capital Taipei, the star attraction is somewhat humbler: a cabbage. Carved from a block of white and green jadeite, the remarkably realistic sculpture of a Chinese cabbage glistens as if freshly picked from a field, still wet with morning dew. A katydid and locust lurk in its verdant leaves, while the unknown sculptor used the material’s natural flaws to create the illusion of ribs running along its stems. Resting gently on a wooden stand, the carving is just 7.4 inches tall. But it is so popular that it occupies its own exhibition hall.…