Sea/Filter is a distinctive commercial facility designed by renowned architect Kengo Kuma, completed in 2001 and located at Kirara Beach in Onoda, Yamaguchi Prefecture. This innovative structure exemplifies Kuma's characteristic approach to contemporary architecture, seamlessly integrating natural elements with modern design principles. The building's name reflects its conceptual relationship with the surrounding coastal landscape, functioning as a visual and spatial filter between the beach environment and human activity. Its thoughtful design creates a harmonious dialogue between commerce and nature, establishing it as a notable example of early 21st-century Japanese architecture that respects and enhances its seaside setting.