Hishi Yagura is a traditional Japanese architectural style characterized by its unique diamond-shaped design. This structure is often found in Japanese castles and serves as a watchtower or lookout point. The name "Hishi" means "diamond," reflecting the shape of the building's cross-section. Typically made of wood and featuring sloped roofs, Hishi Yagura is both functional and aesthetically pleasing. These towers were strategically placed to enhance the defensive capabilities of castles, allowing guards to spot approaching enemies. Today, many Hishi Yagura can be seen in historical sites across Japan, showcasing the country's rich architectural heritage.