Rapolano Travertine rock was known in ancient Etruscan times as a building material. It is a sedimentary rock formed by the precipitation of carbonate minerals from solution in ground waters, often at the mouth of a hot spring or in a limestone cave. The designers have retrieved pieces of this eroded Travertine rock and the beautifully preserved cavities marked by time using a transparent resin resembling the water in which these rocks were submerged throughout time.