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. As global temperatures climb, Japan’s summers have been getting hotter and more humid, with readings regularly exceeding 35 degrees Celsius (95 degrees Fahrenheit). The country’s weather agency has had to come up with new terminology for sizzling-hot days, while national broadcaster NHK routinely warns viewers of heatstroke risk. During the season, pharmacies and household-goods stores fill their shelves with blue-toned products promising cooling relief.