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Mosaic 
is the art of creating images with an
assemblage of small pieces of colored glass, stone, or other material.
It may be a technique of decorative art, an
aspect of interior decoration or of cultural and spiritual significance as
in a cathedral.
Small pieces, normally roughly cubic, of
stone or glass of different colors, known as tesserae, (diminutive
tessellae),
are used to create a pattern or
picture.
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