@humanhorseshoes@azonenberg I checked: It' art, and the artist has a story why it had to be flipped. Something to do with the building being initially designed so that what's now the main entrance used to be the back-entrance, or so.
There's also a similar installation (without spaces) at the collections of art of the ruhr-university... (Kunstsammlungen der Ruhruniversität Bochum).