It is an art nouveau window - I found it under jugendstil.
I like those type of windows.
We had a wooden door from the entrance into the livingarea - a door which had gotten scratched and looked really used.
We wanted a new wooden door and I by accedent saw one can get a art nouveau windown put into the door. They cut out the old wood and just left a frame and put in the glass. AND IT WAS CHEAPER. So I got my dream.