Architects Tuñón and Mansilla designed the MUSAC as a large site for culture: a building on one level built with white concrete walls and large stained glass on the exterior. The floor-plan’s shape is one of its peculiarities, it follows a complex geometry that is dictated by certain old pavements of Roman origin, which result in the shape of two polygons (a square and a diamond) that allow to display a, regular or irregular, continuous surface on a plane. The crystals mosaic made of 37 colors greets visitors at the main facade represent a digitized image of the window ‘The Falconer’ of León’s Cathedral (Castile and Leon).