For each design, Ryu Kosaka pays special attention to the emotional outpouring of space, as if it were an architectural poet in space. He hopes to convey the spirit of the design through the modern expression of light and materials. At the same time, it deepens the connection between people, pays attention to the smallest details, sharpens the senses, and creates a space of timeless quality.

Ryu Kosaka's hotel design has become a bellwether for modern Japanese hotels. His work includes the Main Dining Room of the Mandarin Oriental Tokyo, the design of the public spaces and environment for the Shin-marunouchi Buidling (Marunouchi, Tokyo), the JAL Sakura Lounge (Haneda International Airport) and the internationally acclaimed W Guangzhou FEI Ultra Lounge in China for which he became the first Japanese national to be awarded Best Bar at the prestigious Restaurant & Bar Design Awards.

The deepest impression of Japanese design is: quiet, natural, Oriental and pure. And Ryu Kosaka's design can exactly express the melody of Oriental design, especially his design of lighting, which is not restricted by style and country, he pays more attention to the interpretation of the temperament of space. He prefers to use simple, pure and natural materials.