ART PRIMA MATERIA
Now facing of facades of buildings with natural stone gains popularity. Although artificial analogues outwardly almost impossible to distinguish from natural materials, but strength and reliability, they are still not as good as natural one. In any house travertine will give showiness and will serve several hundred years. Travertine is intermediate unlike stone and limestone, clay, usually formed in mountain caves. The reserves of this material are inexhaustible, deposits about 30 thousand years BC in places of volcanic activity. The properties of travertine were known in ancient times, which confirms the Roman Colosseum, still decorated with this stone till our days. Due to porous structure of stone is easily processed and weighs not heavy.