The result is that, when crossing the perimeter shell, the pupils find themselves in a surprising central space where a set of acronyms at different heights help to understand the interior of the school as a single multiform yard extending over the different floors, configuring a great collection of relationship spaces at different heights. A three-dimensional organization chart built from reinforced concrete, where each classroom or workshop occupies a differentiated volume, allows the acronyms to be seen from the entire yard. A single material builds the structure and the enclosure, permitting a considerable increase in façade surfaces while minimizing construction and maintenance costs.