Introduction to the Yunlong Sleeve Walls: The Yunlong Sleeve Walls are on the left and right sides of the Kaiyun Gate, like two sleeves on clothes. They are hanging mountain-style green brick wall caps. The sleeve walls are made of Yunhai Jiangya Shenglong ceramic blue bricks. The relief color painting, the rising dragon is lifelike, ready to be seen, and the craftsmanship is exquisite. Although it has gone through nearly 360 years of historical vicissitudes, it has not been weathered or damaged at all. It is indeed a very rare art treasure.