This sign details all materials and examples of decoration used in classic mosaic work, it shows the different examples of andamenti(flow ) in the background of the lettering , The letters I-A = opus palladianum A-O opus regulatum M-S opus vermiculatum and A-C opusTessalatum. The left hand side is executed in unglazed ceramic mosaic tiles and the right hand side is mainly coloured vitreous glass mosaic with a small example of smalti and opus romano.