Semper in particular developed an international following, in Germany, England, Switzerland, Austria, Bohemia, France, Italy and the United States. The generation born during the middle-third of the 19th century was largely enthralled with the opportunities presented by Semper's combination of a breathtaking historical scope and a methodological granularity. In contrast to more recent, and thus "modern", thematically self-organized theoretical activities, this generation did not coalesce into a "movement." They did, however, seem to converge on Semper's use of the concept of "Realismus", and they are thus labelled proponents of architectural realism. Among the most active Architectural Realists were: Georg Heuser, Rudolf Redtenbacher, Constantin Lipsius, Hans Auer, Paul Sédille, Lawrence Harvey, Otto Wagner and Richard Streiter.