Unable to answer "What kind of artwork is this?" – Atelier Amelung - Hatzenbühler (Artwork) – https://osm.org/node/2100227855 via StreetComplete 63.1:

it's an artists house and workshop

Attached photo(s):
https://streetcomplete.app/p/348259.jpg
https://streetcomplete.app/p/348260.jpg