It takes the shape of a dome due the presence of archway inside (made using the ‘intersection and the development of arches that unload their weight on the thick side walls). Also its shape is useful to collect rainwater as the roof is always connected, by some pipeline, to the water tank.
The roof of a dammuso, is not just a roof, it becomes a mystical place, of meditation, of admiration… imagine the glorious moments of tan under the sun of Pantelleria or a magical night spent counting the stars of the infinite sky…