How did the Azuchi castle differ from previous castles?

Azuchi Castle, built in the late 16th century by Oda Nobunaga, marked a significant evolution in Japanese castle architecture. Unlike earlier castles, which were primarily defensive structures, Azuchi featured a more elaborate design with a central keep that showcased artistic elements and served as a symbol of power. It incorporated innovative features such as multi-storied towers, extensive use of stone foundations, and a strategic layout that emphasized both defense and aesthetic appeal. This blend of functionality and grandeur set a new standard for subsequent castles in Japan.