The architectural value of the structure is enhanced by the roofing on domes and skylights. Palaces have been built with domes made of gorgeous facades connected together with brick mortar since antiquity. Aside from its architectural splendour, domes provide excellent day lighting, considerably cutting energy expenditures. Modern skylight roofing is entirely constructed of glass, and the supporting panels take up as little space as possible, allowing the full spectrum of light to pass through.