In Besançon and with the teenagers students of the college Diderot, the choice of Cyprien Desrez went to the manufacture of sandstone bricks. The college students each represented a region or a country on each brick, with the final aim of gathering them all in an English or Flemish layout on the entrance wall of their college. Supported and helped by the CFA Vauban team, Cyprien and the SEGPA students were finally able to put their bricks on the entrance wall of the college.