Who knows this clinker? Clinker clinker clinker

Using reverse image search with your image, you come across the project page for "CB Residence" by "Marc Merckx Interiors".

When I then search for "CB Residence Herentals, Belgium", I find, for example, a Pinterest result that mentions "Petersen Bricks" in the title.

And when I search for that, I find the website of a Danish brick manufacturer who offers some bricks that could match yours (e.g., D91).

"Petersen Bricks"
...
(e.g. D91)

See my tip above in #6...

Looks very much like format "FF" to me as well.

You are right, it is the Petersen D91. Thank you very much!