At the end of the second decade of the twentieth century appears, especially in the architecture department stores, Reducing the variety of secession, in which great przeszkleniom and planes accompanied by a relatively simple and rigorously deployed pilasters, and the ornament is focused on the top and the entrance to the building. After 1918, art nouveau architecture is gradually disappearing, merging with the eclectic style in 1920, which combines classicism, Neo-baroque and early modernism.
After World War I art nouveau that had previously seemed an anachronism, met almost exclusively with severe criticism from the contemporary avant-garde. Many architects who created the first Art Nouveau, it has become radical followers of functionalism.
Secession in comparison with other styles was merely an episode in the history of architecture, but led to permanent transformation in the understanding of the role of architecture and design process.