The basic compositional principle derives from the fusion of the form and function of the construction system of the composite structural timber shell, which is conceptually linked to the “kyathos,” a form of ancient cup. The shape of the elements of the shell face refers to the cup-shaped flowers and the milky sap secreted by the stems and leaves of the milkweed plant of the genus Euphorbia, which grows abundantly in Greece with more than 40 species. Firstly, the new building rests on a podium base made of reinforced concrete for the areas below the final level of the court, leading to the pedestrian street; secondly, it is formed of wood products for the areas above the final level of the court, namely, glue laminated timber, plywood and cross-laminated timber.

The wooden supporting body is organised around the perimeter of the indoor gymnasium in a rectangular framework measuring 45 meters in length and 30 meters in width, with a reach of 5 meters. The shell consists of 10 identical isostatic beams bridging a 30-meter span. They are symmetrical and consist of beams and posts, as shown in the designs, and function as a triple arch. Additional metal elements are used when deemed necessary, mainly as connecting elements but also as stiffness elements. The roof is covered with special lightweight pieces of waterproof, recyclable, printable plastic polymer with high weather resistance.

The challenge of the architectural design is to create a bioclimatic structural shell that will ensure the building is permanently in the shade, that favours natural ventilation, cooling, and lighting, recycles water from the roof and shaped surfaces for irrigation, fosters collegiality, healthy competition and promotes the idea of “fair play,” uses natural structural recyclable materials guided by the triple methodology of sustainability principles, enriches the existing Mediterranean flora of the Grove, and finally, it is integrated to the global network of sustainable constructions by minimising its ecological footprint while simultaneously increasing its positive impact on the environment.