During this time, Thonet-Mundus adjusted its product line to new customer demand and to the ideas of a modern lifestyle, which was promoted from the 1920s onward by modernist designers and architects. Thonet chairs were hailed as examples of simplicity and economy, qualities that were promoted by functionalists. Many pre-eminent designers worked on bentwood furniture designs for Thonet-Mundus at this time, including Josef Hoffmann, Adolf Gustav Schneck and Josef Frank. Thonet furniture was also favoured by famous architects, including Le Corbusier. The interwar period also saw growth in tubular steel furniture, which was later manufactured in some Thonet-Mundus factories. Another player in this new sector was the Bystřice-based company Slezákovy závody, which began to produce tubular steel furniture as early as 1908.