French red marble, Spanish Alicante marble
The circular shape of varicolored marble here is not for tensioning. It is simply that small segments of marble have been used rationally to make a circle. Large objects can be made from small stone elements which may thus result in a structurally homogeneous element called sculpture, unlike a house, let us say, which remains a piling of discrete stones. The structure of the sun translates into a visually powerful entity because of its inherent tensile unity of shape.