Klein Dytham architecture (KDa) is a multi-disciplinary design practice known for architecture, interiors, public spaces and installations. Established by Royal College of Art graduates Astrid Klein and Mark Dytham in Tokyo in 1991, today KDa is a multi-lingual office with an international reputation and a high-profile client list which includes Google, Tsutaya, Sony, Virgin Atlantic, Nike, Uniqlo, Selfridge's and Japan Rail.