" The 12 Eternal Castles" poster series is an experimental work that merges the aesthetic beauty of Japanese castle architecture with typography. Japanese castles developed alongside advances in civil engineering. Each castle took advantage of Japan’s mountainous terrain, resulting in irregular layouts and unique structures, heavily influenced by the surrounding environment and geographical conditions. This series explores new possibilities in typography by focusing on the castles' irregular layouts and integrating them with letterforms. The design captures the castles’ uneven levels—shaped by the mountainous landscapes—through variations in the size and structure of the typography. Though the design is two-dimensional, it incorporates a sense of space. This approach emphasizes the cultural significance of Japanese castles while also highlighting the structural beauty and cultural value of typography.