The expansion plan for this school dating from the 1930's was substantial: it called for six classrooms, a school kitchen and refectory, a music room, computer rooms, and numerous other features. Almost all the additional facilities were to be located in front of the original school, although at a slightly lower level, thanks to the differing planes of the two areas and to a certain amount of digging to correct a slight grade in the terrain. The extension is built of structural concrete panels, coloured in the mix, in a staggered or quincuncial arrangement.

The glass partitions, blue-green, bright and shimmering, punctuate the concrete and underscore its presence as sheer volume while at same time diminishing the oppressiveness of its mass. Seen from the classrooms, the landscape outside is displayed at rhythmic intervals through fixed windows with silver stripping and windows designed to provide natural ventilation, with tall thin panes perforated by simple circular apertures reminiscent of soap bubbles billiard balls, or balloons.