Four sherds of mosaic glass, 332 BC-200 AD.

4 sherds of mosaic glass, made in Egypt, from Ptolemaic or Roman periods. Mosaic is a technique for decorating floors and walls, where square or rectangular pieces of stone, glass or ceramic are set in a mortar. The Romans used mosaic pavements in public buildings and private villas. Throughout the empire local stones were used supplemented by some imported pottery, glass and brightly coloured stone.