lost

In the mountain castle town of Gujo Hachiman, look down into the roadside canals and you will see giant orange and white koi carp swimming past your shoes. These are not decorative ponds inside a ticketed garden. They are the open street drains running right beside the front doors of ordinary houses. Four hundred years ago, after a great fire destroyed the town, the feudal lord built a network of stone channels to bring pure spring water down from the mountains into every neighborhood. Today, residents still step out of their kitchens with bamboo baskets to rinse fresh spinach or chill summer watermelons right in the street canal. How does the water stay pure enough for trout and koi when an entire town uses it every day? Because the town follows an unwritten contract that has lasted four centuries. Inside the communal washing stations, water flows through three wooden tiers. The top tier is strictly for drinking water and rinsing fruit. The middle tier is for washing vegetables. The bottom tier is for rinsing dishes, with zero chemical soap allowed. The tiny bits of rice left on the plates wash into the canal, where the carp eat them and keep the stones clean. No environmental police patrol the lanes. People simply keep the water clean because their neighbor downstream is going to use it next.