Opus palladianum
Encyclopedia
Opus palladianum is a technique used in mosaic
Mosaic
Mosaic is the art of creating images with an assemblage of small pieces of colored glass, stone, or other materials. It may be a technique of decorative art, an aspect of interior decoration, or of cultural and spiritual significance as in a cathedral...

 art in which the tessera
Tessera
A tessera is an individual tile in a mosaic, usually formed in the shape of a cube. It is also known as an abaciscus, abaculus, or, in Persian کاشي معرق. In antiquity, mosaics were formed from naturally colored pebbles, but by 200 BC purpose-made tesserae were being used...

e are irregularly shaped, and are not laid out in a regular pattern.
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