The division of public space vs. private is described in the choice of materials used, predominantly for the floor surfaces. To maintain the fluidity of the spatial sequence on the ground floor, a continuity of colour and texture was desirable; this is only contrasted by the slate floor in the sunken room due to the change in level. On the first floor this is contrasted with a softer treatment for the circulation areas and smaller rooms. The mirrored wall delineating the passage to the first floor acts as an interface which bounces light back into the main space below.