This deepest of the mural techniques is preferred by us in thinking about the sacred interior. By introducing an observer in another world, another reality, is a technique which we can call - sacral. Each image, each plane is containing thousands of tiny tesserae. Arduous, requiring enormous patience work brings results which are difficult to compare with any other mural technique. The oldest Venetian manufactory in which we store, produce a material, so-called smalta, in several thousands of colors. This is why in this technique it is possible to reproduce any project. About the durability of this technique testify mosaics created centuries ago in Venice, Ravenna and Rome