The buildings "Arbon-" and "Hornstaad" were build in the style of typical lake-dwelling houses of the Stone Age.
One the left you can see the so called "Maus-Haus" (= Mouse House). It was build for the kids TV show "Sendung mit der Maus". The craftsmen only used replica of of the Stone Age. Though these tools may look primitive on the first look, it was possible to finish the building in less than a month.