Opus palladianum

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Opus palladianum is a technique used in mosaic art in which the tesserae are irregularly shaped, and are not laid out in a regular pattern.

Mosaic image made from an assemblage of small pieces of colored glass, stone, or other materials

A mosaic is a piece of art or image made from the assembling of small pieces of colored glass, stone, or other materials. It is often used in decorative art or as interior decoration. Most mosaics are made of small, flat, roughly square, pieces of stone or glass of different colors, known as tesserae. Some, especially floor mosaics, are made of small rounded pieces of stone, and called "pebble mosaics".

Tessera individual tile used in a mosaic

A tessera 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.