The extension of the existing school of 1952 is a sample project of sustainable energy and use. The large extend of sustainability of the building is obtained by the long life of the building elements, the use of sectional components, low temperature heating, passive cooling and waste heat recovery of the ventilation system. The purpose of the design was to bring light in a rather closed and dark building. Also we wanted to make a new focal point for the students to gather and meet. The center is a building high atrium that is lighted by a sloping roof with in composite sections mounted colored sheets of glass. This gives literally a bright effect by the play of colored light and shadow with the different building parts around the atrium. Innately the daylight colors the sections, but it also brushes the glazed breasts of the galleries, and more solid elements as walls and columns as well. Because the incidence of light changes every moment of the day the interior of the building always looks different. The color combinations just have the right intensity to achieve the desired effect, without making a restless impression or even irritating the eyes. At the level of the first floor the atrium is cleaved by a foot bridge that runs parallel to the building line of the extension. The facades of the new building are built load-bearing, which optimized the flexibility and permanency of the new development.