Of particular impact was the Giedion's role in connecting leading protagonists of modernism in architecture, art, and literature, such as Alvar Aalto, Hans Arp, Constantin Brancusi, Marcel Breuer, Max Ernst, Walter Gropius, Barbara Hepworth, Le Corbusier, László Moholy-Nagy, Piet Mondrian, or Sophie Taeuber-Arp. The estate of Sigfried and Carola Giedion-Welcker comprises some 16,000 letters, 10,000 photographic prints and negatives, a wealth of other papers, and a vast library. This new book offers a revaluation of Sigfried and Carola Giedion-Welcker work, impact, and lasting significance. Editor and contributors were the first to draw fully on the estate, which has been opened entirely to researchers only recently. Featuring a vast number of previously unpublished documents and other images alongside excerpts from the extensive correspondence the two maintained with their artist friends and colleagues in academia, it provides a unique and manifold insight into the “Giedion universe.”