Preprint

Two building traditions that never met — the Cycladic vernacular of the Greek Aegean and the Najdi–Asiri vernacular of central and south-western Arabia — share a striking set of formal features: thick monolithic walls, small guarded openings, hand-modelled parapets, and, most visibly, fields of triangular perforations cut high into the wall. This paper argues that the resemblance is a case of architectural convergence rather than cultural borrowing. Both traditions independently solved the same environmental problem (intense solar radiation, large diurnal temperature swing, scarce timber, abundant stone or earth) using the same instrument, the human hand, and so repeatedly arrived at the same forms. The two traditions are shown to diverge only on the variables set by local geology — colour and base material — while converging on every variable set by climate and craft. The triangular perforation is analysed as a thermally and structurally optimal opening for compression-only masonry. The simultaneous contemporary revival of both vernaculars (K-Studio’s Mykonos Airport and the Diriyah developments in Riyadh) is presented as fresh evidence at architectural scale. A focused side-by-side study of these two specific traditions appears to be absent from the existing literature.