BIG will design this year's Serpentine Pavilion (center: Bjarke Ingels; portrait by Jonas Bie) and four practices were asked to design smaller Summer Houses (clockwise): Yona Friedman at work in Los Angeles; Asif Khan, portrait courtesy Adriano Mauri / Design Indaba; Barkow Leibinger, portrait by Benedikt Kraft; Kunlé Adeyemi, portrait by Reze Bonna.