The differentiation of volumes resulted from functional units, phased construction and the desire to interpenetrate the interior and exterior space. The school yard, a space exposed to less insolation, was formed by the mutual volume ratio. By rotating the tract of classrooms towards the east, additional external intermediate spaces were generated that contribute to the permeation of internal and external space. The aim of rotating that part of the building was to make its facade more intensively exposed to the main road. The treatment of facade planes established an active relationship with insolation and climatic specifics, which was used as an essential element of architectural expression.