On Doornob today:

For Japanese studio 403architecture, the answer to a simple and rustic floor made of reclaimed materials was right above their heads. The firm used timber stripped from the ceiling of a Hamamatsu apartment to create a quirky unvarnished wood block floor that has been sanded smooth as an alternative to a tatami mat.

via Reclaimed Patchwork Wood Block Floor Has Character | Designs & Ideas on Dornob.