A three-layered magic circle. It protects the floating city. The three-layered magic circle is easy to arrange if you imagine it as "sky side, city perimeter, and city center" for protection. Outer layer: A large thick ring that surrounds the entire city, with directional symbols, and symbols that evoke walls or barriers. Middle layer: At the height of the city's buildings, with intricate geometric patterns, such as a network of hexagons and triangles, and motifs like chains. Inner layer: Mount Fuji