Chamikai (Part 4) "So" represents a collaborative architectural work by three distinguished Japanese designers: Atsushi Kitagawara, Takashi Sugimoto, and Masashi Kurokawa. This project exemplifies the contemporary Japanese design philosophy that emphasizes simplicity and essential forms. The building showcases the designers' shared commitment to minimalist aesthetics while exploring the intersection of function and artistic expression. Through their collective vision, the architects created a space that reflects the Japanese concept of "ma" (negative space) and understated elegance. The collaborative nature of this work demonstrates how multiple creative minds can unite to produce a cohesive architectural statement that transcends individual design signatures.