Abstract photography, MAMCO – Musée d’Art Contemporain de Genève – it was a factory for high-precision scientific instruments. Factory existed since 1860, but the building transformed into the museum dates only 1958. They kept original material for floors. The pinkish material on my photo is named “Eubolith” and is a mixture of sawdust and magnesite, chosen for its insulating and damping properties.
more infos:

https://archive.mamco.ch/public/10_Pistes_pedagogiques/archi_Mamco.pdf