Nara-machi Koshi-no-ie — Preserved Edo Merchant House

**Architectural details:** Machiya architecture reflects Edo urban taxation and fire prevention. Narrow frontage minimized property taxes (assessed per street-facing width). Deep layout created eel-bed shape (unagi-no-nedoko, うなぎの寝床). The central doma (earthen corridor) acted as fire break — if neighboring houses caught fire, the doma's dirt floor wouldn't burn, protecting the rear of the house. Observe the progression from public (shop front) to private (rear living quarters) as you move deeper — spatial hierarchy reflecting social relationships. The inner courtyard (tsubo-niwa) brought light and ventilation to the house's dark interior. **Koshi lattice function:** The wooden lattice facade (格子, koshi) is both aesthetic and functional. The slat spacing allows residents inside the dark shop to see pedestrians clearly while outside viewers see only darkness within — asymmetric visibility favoring the merchant. This let shop owners monitor potential customers without appearing to stare. The lattice also filtered harsh sunlight, cooled entering air through evaporation (when water was splashed on front pavement), and deterred thieves by obscuring valuable goods. Contemporary Naramachi machiya retain these lattices, creating the district's distinctive streetscape. **Volunteer interactions:** Elderly volunteers (often retired Naramachi residents) staff the house and demonstrate seasonal crafts — January brings rice cake pounding demos, May displays Boys' Day decorations, autumn shows harvest crafts. Volunteers speak limited English but are friendly and use gestures to explain activities. Some volunteers lived in machiya as children and share personal memories (through translation apps or visiting Japanese speakers). This oral history dimension adds human connection to architectural preservation — the house isn't just a museum but a living repository of urban memory.