<Ul> <Li> Opus regulatum: A grid; all tesserae align both vertically and horizontally . </Li> <Li> Opus tessellatum: Tesserae form vertical or horizontal rows, but not both . </Li> <Li> Opus vermiculatum: One or more lines of tesserae follow the edge of a special shape (letters or a major central graphic). </Li> <Li> Opus musivum: Vermiculatum extends throughout the entire background . </Li> <Li> Opus palladianum: Instead of forming rows, tesserae are irregularly shaped . Also known as "crazy paving". </Li> <Li> Opus sectile: A major shape (e.g. heart, letter, cat) is formed by a single tessera, as later in pietra dura . </Li> <Li> Opus classicum: When vermiculatum is combined with tessellatum or regulatum . </Li> <Li> Opus circumactum: Tesserae are laid in overlapping semicircles or fan shapes . </Li> <Li> Micromosaic: using very small tesserae, in Byzantine icons and Italian panels for jewellery from the Renaissance on . </Li> </Ul> <Li> Opus regulatum: A grid; all tesserae align both vertically and horizontally . </Li> <Li> Opus tessellatum: Tesserae form vertical or horizontal rows, but not both . </Li> <Li> Opus vermiculatum: One or more lines of tesserae follow the edge of a special shape (letters or a major central graphic). </Li>

The image shows a roman mosaic. a mosaic like this one was made from