This article explores the legacy of iconic designer Michele De Lucchi, who reflects on his lifelong collaboration with the late Issey Miyake, focusing on their shared commitment to sustainable design and their belief in the power of architecture to shape human behavior. The article examines the exhibition ‘Roppongi Rokken: Six Houses by Michele De Lucchi’ at 21_21 DESIGN SIGHT, highlighting De Lucchi’s vision for a future where sustainability is deeply intertwined with human relationships and individual consciousness.