Mosaic

image made from an assemblage of small pieces of colored glass, stone, or other materials / From Wikipedia, the free encyclopedia

Mosaic is the art of decorating a surface with pictures and patterns made of little pieces of stone, glass or tiles of different colours.

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The most famous mosaic of Ancient times is in Pompeii and shows Alexander the Great
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An early Christian mosaic in Rome

Mosaics can be used indoors on walls, floors and ceilings. Mosaics are sometimes used outdoors on pavements.