Giebelwände Fachwerk (1959-79) by Bernd Becher and Hilla Becher.
The beauty of architecture is sometimes lost within its own functionality. So they turn it into sculpture. Anonymus sculpture, for that the artist is no one but itself. Being created and creating at the same time, Schaffende und Geschaffene.
The autonomy of functional things.
Are they not Mondrian? Geometry following the rules of physics is no less beautiful than geometry born out of artistic intuition. Absence of colour reminds us to look at Mondrian in a more conscious and reflective way. It reminds us of the artificial aspect of art.
A repetition and variation at the same time, like a baroque suite.