Office space in a historic building in Celetná street in Prague center is spread into four floors and with many offices and connecting corridors required to visually unify. Since it was clear from the beginning that the interference in this area must be very sensitive, the concept of abstract colorful mosaics was chosen. The mosaics were put together on the spot, without pre-prepared design. The highlight of this project is the new design of the reception desk and reconstruction of the entire reception area.