Marble from the outside the city of Kastamonu is used on the North and North-West facades of the building as an external rain screen cladding system. The joints between the stone panels, which are hung from the concrete structure with a galvanized steel fixing system, are left open to allow rain to drain through the façade and out. This open detailing allows us to create a highly precise and crisp detail between the stone panels. The stone is given a rough finish which exposes the fossil structures behind the surface layers and gives an organic feel to the façade treatment which contrasts with the refined and precise finishes of the glass, metal and stainless steel elements.