The Finnish architect Alvar Aalto (1898-1976) is one of the great figures of modern architecture, ranked alongside Gropius, Le Corbusier and Mies van der Rohe. This film analyses Aalto's uniquely successful resolution of the demands and possibilities created by new technology and construction materials with the need to make his buildings sympathetic both to their users and to their natural surroundings. His inventive use of timber in particular represents both a reference to the forest landscape of Finland and a building material that is 'warm' and extremely adaptable. Filmed in Finland, Italy, Germany and the United States, this documentary shows how the Finnish natural environment and art traditions were essential elements in Aalto's pioneering harmonization of technology and nature.