Japan Loves Nagoya

Twenty kilometers outside the city of Nagoya in central Japan, on ground that was the Aichi Youth Park, a glittering futurescape has risen at the site of the 2005 World Exposition. Visitors at the expo's Mitsui-Toshiba pavilion are taken on a multimedia journey through outer space that speculates on the feasibility of travel to distant reaches of the universe. At the Japan pavilion, saltwater red snapper and freshwater carp live side by side in the same pool—a marvel accomplished by infusing the tank with "oxygenated nanobubbles." Throughout the 173-hectare grounds, more than 25 robots are on patrol, sweeping the walkways and...