The 'Klavertjevier' (four-leaf clover) Primary School was ready for extension. Architects Marc Belderbos and Marc vande Perre of AAC architectes have added 12 new classrooms, a gymnasium, a room where the children rest and a caretaker's lodge, as well as providing a proper entrance hall and a canopy to partially cover the playground. There is a break where the old and the new parts meet. The architects have turned it into a fold and the resulting corner in turn determined the new floor plan in which the classrooms are arranged like alcoves. No two are the same size and no corner between any two classroom walls forms a right angle. The logic of the floor plan and the building has been enlarged into lines in concrete and brick. For instance, the staircase on the west side of the building has been turned into a sculptural element. The bricks and concrete form work slope upwards, while the rainwater on top of the glazed roof runs downwards, creating a small waterfall flowing into a pool.