Mosaics A mosaic can be defined as an "eternal picture" because of its ancient origins, which goes back to 3000 B.C. During the centuries all types of materials have been used in this art such as stones, glass, marble and terra-cotta. During the Roman period mosaic flooring was often adorned by a central square illustration, its emblem being the focal part of the entire picture. This would bee produced separately or on a workshop table or upon a kempen cloth and then transferred  into the mosaic. This simple custom gave origins to the "emblemata", a sort of portable mosaic, that could be transported from one place to another.

Stained glass windows A stained glass window is a mosaic made up of coloured glass bound together by listels of lead; this is regarded as an architectural element therefore its internal positioning must be studied in consideration of the external light.

Glass-fusing The technique of glass-fusing is very ancient and the various archeological remains demonstrate how this art had had both artistic and domestic use since the year 1500 B.C.: from the ancient Egyptian  period up to the Roman Empire. Since the VI century A.D., this art has been replaced by glass-blowing, but at the end of the XIX century with the "art-Nouveau" trend, there has been a renaissance of all these glass techniques and the first real attempts of glass-fusing have been accomplished by the 'pâte de verre', technique used by Gallé, Lalique and Tiffany.