In the world of architecture and interior design, true synergy is rare, but when it happens, the results are nothing short of extraordinary. Quatre Mains: Creative Duos in Architecture & Interior Design is a celebration of that rare alchemy that occurs when two creative minds come together with shared vision, mutual respect, and complementary talents. Inspired by the concept of a piano duet, quatre mains in French, where two pianists perform on the same keyboard in perfect harmony, this high-end coffee table book presents intimate portraits of 35 exceptional duos. These include couples, parent–child teams, best friends, and business partners whose partnerships have redefined collaboration in design. Each profile pairs their story with one of their most iconic or signature residential projects, offering a window into the world they have built together, both personally and professionally. Rather than simply combining two talents, these collaborations represent something greater than the sum of their parts. Each partner brings their own sensibilities, instincts, and expertise to the table, enriching and challenging one another along the way. The result is bold, timeless, and deeply personal spaces that reflect not just one vision but a shared creative heartbeat. Quatre Mains is an homage to the beauty of working in tandem and the enduring power of creative partnership.