The first thing you notice about the Castile-Leon Museum of Contemporary Art (MUSAC), located in the heart of the tree-lined Avenida de los Reyes Leoneses, is the stained glass façade. This original feature is precisely one of the reasons why the Mansilla + Tuñón Architectural Study was awarded the prestigious Mies van der Rohe Prize in 2007. What is most extraordinary is how they selected the colours: by digitising an image from one of the stained-glass windows in the Cathedral of León.