The key tectonic element of the building are undoubtedly the triangular reinforced concrete frames, which give the hall its pyramidical profile. The immediate understanding of their triangular shape is multifunctional, on one hand interpreting the sloped roofs of the vernacular architecture in Bulgaria subtly smirking at the rejected ethos of Brutalism and its fear of traditionalism - and on the other, blending the building with the surrounding park area avoiding unnecessary height domination, simultaneously solving all main structural problems of that kind of sports hall. Although the primary purpose and aspiration of the artistic act in the Tennis Hall is the satisfaction of certain utilitarian requirements and needs, it nevertheless manages to excel beyond any such simplistic categorisations. Therefore, the materials, technology and structural principle applied in the Tennis Hall also relate to the need for the ability to express the aesthetic ideals of its society (fig. 31-33)
Figure 32. Stefka Georgieva, Indoor Tennis Hall, 1965-68, Sofia, concrete frame detail
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