The document discusses the purposes and design of Japanese castles during the World Cultures Period 2. Castles provided protection, housing, beauty, and supported the military and economy. Towns were built around castles, which had many defensive features like gates, trap doors, and dead ends. Castles had about 15 floors and samurai lived close by to guard the castle. The daimyo would call commands from tall turrets. Everyone worked for the emperor and set up stands on streets and shrines. Castles served multiple purposes including protection, selling goods, and construction.