"Don't touch that," i thought to myself as I watched a toddler stumble across the park of the Baur au Lac hotel in Zurich, Switzerland. His father called his name; the boy laughed and kept going, wobbling at an ever-faster pace. He was headed for a shiny, two-meter, red-and-green No. 6. The $550,000 sculpture, on display in the hotel's front garden, was created by pop artist Robert Indiana. His series of brightly colored aluminum numerals represent each stage in a man's life. Six is wisdom. The toddler tagged it as if it were home base.