SUMIKA Project by Tokyo Gas House before House is a residential building completed in 2008, located in Utsunomiya, Tochigi Prefecture. Designed by the renowned architect Sou Fujimoto, this innovative dwelling showcases his distinctive design philosophy that seamlessly blends interior and exterior spaces. The project demonstrates Fujimoto's characteristic approach to creating fluid architectural environments through carefully considered spatial relationships and minimal structural interventions. With its thoughtful integration of natural light and open planning, SUMIKA represents an important contribution to contemporary Japanese residential architecture and exemplifies the cutting-edge design principles that have established Fujimoto's international reputation.