King of the Mountain is serious business in Manhattan. It's not easy ruling the unruly kingdom (ask any builder or Wall Street trader). Usually, kids are on the losing end of the city's scale. Tall buildings shrink them down to mice. Elevators threaten to eat their tiny hands and sneakers. Dogs bark or growl nose to nose. Even kind strangers engulf like giant lampposts. But every now and again—on a swing, a parent's shoulders, or atop a manmade snow hill in Central Park—perspective reverses. Buildings become Lego blocks. Traffic runs on Matchbox toys. A snowscape becomes a moonscape; the sky tastes like cotton soup. Suddenly, the city is entirely theirs.