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tessera
A tessera (plural: ''tesserae'', diminutive ''tessella'') is an individual tile, usually formed in the shape of a cube, used in creating a mosaic. It is also known as an abaciscus or abaculus.
==Historical tessera==
In early antiquity, mosaics were formed from naturally formed colored pebbles, but by 200 BCE cut stone tesserae were being used in Ancient Roman decorative mosaic panels and floor mosaics. Marble or limestone were cut into small cubes and arranged into representational designs and geometric patterns.
Later, tesserae were made from colored glass, or clear glass backed with metal foils. The Byzantines used tesserae with gold leaf, in which case the glass pieces were flatter, with two glass pieces sandwiching the gold. This produced a golden reflection emanating from in between the tesserae as well as their front, causing a far richer and more luminous effect than even plain gold leaf would create.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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