Jugendstil is what Art Nouveau was called in Germany. After going repeatedly through several hundred pages of Der Modelleur
I'm seeing direct links with Romanesque Art.
There's the interlocking lines and patterning. There's also inspiration straight from nature. The buildings bloom with plant and animal life. There's humor and horror, the macabre and the whimsical.
Why are so many modern buildings impersonal and boring?