The existing school complex in the town of Oudkarspel, consisting of the primary schools Barnewiel and St. Maarten, has been expanded with the daycare centre Pinokkio and nine extra class rooms. Due to limited space on the site it was decided to integrate the daycare centre in the existing class rooms, and to add the new seven class rooms above the existing school. These class rooms can be reached from both schools and can be used by both schools.
The location is characterised by the presence of many trees, a unique situation in a landscape dominated by polders. These trees provided the inspiration for the architectural language of the facades of the complex. The new class rooms are interpreted as abstract tree houses. The coloured facade panels, columns and sills together make up the trunk, branches and leaves, which may take on different colours in the course of a year.