The Eerste Openluchtschool (First Open Air School) in Amsterdam is a model example of Modernist architecture, of the Dutch ‘Nieuwe Zakelijkheid’ (New Objectivity) to be exact. Johannes Duiker projected a concrete and glass building that shows proudly its glass-free corners thanks to the white-painted cantilevered structure. The school is a pure cubic volume rotated 45º degrees to the courtyard block where it is located. The only addition to the cube is the gym area in the ground plan…