The book includes selected excerpts from letters, articles, speeches and treatises of famous architects of the 20th century such as Louis Henry Salivan, Walter Gropius, Otto Wagner, Hannes Meyer, Henri Van De Velde, Ludwig Mies Van Der Rohe, Hendrik Petrus Berlage, Alvar Aalto, Hermann Mutesius, Oskar Niemeyer, Peter Behrens, Kenzo Tange, Adolf Loos, Pier Luigi Nervi, Antonio Sant'elia, Joe Ponti, Frank Lloyd Wright, Ernesto Nathan Rogers, Auguste Perret, Bruno Dzevi, Le Corbusier, Minoru Yamasaki, Theo Van Dusburg, Eero Saarinen, Jacobus Johann Peter Aud, Luis Kahn, Erich Kahn, Erich Mendelsohn, Robert Venturi, Hugo Hering, Alison and Peter Smithsons.