In September 1907, he made his first trip outside of Switzerland, going to Italy; then that winter traveling through Budapest to Vienna, where he stayed for four months and met Gustav Klimt and tried, without success, to meet Josef Hoffmann. In Florence, he visited the Florence Charterhouse in Galluzzo, which made a lifelong impression on him. "I would have liked to live in one of what they called their cells," he wrote later. "It was the solution for a unique kind of worker's housing, or rather for a terrestrial paradise." He traveled to Paris, and during fourteen months between 1908 until 1910 he worked as a draftsman in the office of the architect Auguste Perret, the pioneer of the use of reinforced concrete in residential construction and the architect of the Art Deco landmark Théâtre des Champs-Élysées. Two years later, between October 1910 and March 1911, he traveled to Germany and worked four months in the office Peter Behrens, where Ludwig Mies van der Rohe and Walter Gropius were also working and learning.