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Ptghni is one of the oldest examples of a domedroom (Kuppel-Halle). It is composed of a single wide nave subdivided by four pilasters supporting the dome. The solution of the trumped squinches shaped like fans (funnel shaped niches) which support the dome placed on a high drum is particularly remarkable. Equally remarkable are the hall barrel vaults along the longitudinal walls which counter the lateral thrust of the cupola.
Ptghni is the prototype of a number of similar buildings in later centuries. Only ruins of it remain at present.
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