The glass door closes, and a curtain of cool air spills over your head, neck and shoulders, delivering instant relief from the punishing summer heat. This is what it is like to chill in the Do Hiemon Box, an oversized stainless-steel refrigerator that looks big enough to fit a human being, because that is exactly what it is designed to do. Trusco Nakayama has sold about 200 of the 1.5 million yen (US$9,500) booths to steel mills, construction sites, golf courses, universities and leisure...