Design | 5 hours ago | By Deyan Sudjic Antonio Citterio reflects on his work with Flexform, and conceiving a sofa as the heart of the home Antonio Citterio reflects on his work with Flexform, and conceiving a sofa as the heart of the home Antonio Citterio designed the Groundpiece sofa for Flexform in 2001: twenty years on, we chart the architect’s history of collaboration with the Italian furniture company, and discover his view on redefining domestic interiors Designer Antonio Citterio at Flexform’s Meda HQ with his bestselling 2001 ‘Groundpiece’ modular sofa. Low and deep, the sofa was designed as a more relaxed and casual approach to seating.