Corner towers of the Forbidden town were established in 1420, rebuilt within the Qing Dynasty (1644-1911). joined a part of the Forbidden town, they served because the defense facility simply because the lofty walls, the gate towers and therefore the moat. The corner towers rest on the bottom with Buddist-style building surrounded with stone columns. There goes a tale regarding the development of the Corner Tower. Zhudi, Emperor Yongle of the Ming Dynasty, ordered the chief project commander to make four fine corner towers, every with nine girders, eighteen posts and seventy two ridges. The chief project commander gathered all the formans and carpenters along and gave them 3 months to satisfy the mission. This was very a bitter pill to swallow as no one had ever seen such difficult nonetheless delicate corner tower. Deep in worry, a carpenter met an recent man selling grasshoppers and acquired a grasshopper cage for relief. To his surprise, the fragile grasshopper cage with layer upon layer had simply nine girders, eighteen posts and seventy two ridges. Thereafter the look of the corner tower was brought out. it's said that the recent man was the daddy of the builders, Luban. this is often undoubtedly nothing however a tale. However, the four corner towers of the Forbidden town inherited the pliability of the normal wood structure construction and therefore the skillful combination of the operate and decoration indicated the very good and glorious craftsmanship of ancient Chinese craftsman