The craftsmen of Philippopolis who laid the mosaic image used the technique opus vermiculatum.
2.
"Opus vermiculatum " originated in Greece, later than other mosaic methods.
3.
In Ancient Roman mosaics Opus vermiculatum was the most detailed technique, and pieces are often described as " vermiculated " in English.
4.
""'Opus vermiculatum " "'is a method of laying mosaic tesserae to emphasise an outline around a subject.
5.
The use of " opus vermiculatum " declined after the 1st century AD, but continued to be employed for finer Roman mosaics until the 4th century.
6.
Usually " opus vermiculatum " is meant to put emphasis on the main design and foreground details of a work, using a smooth and flowing halo-effect.
7.
The name " opus vermiculatum " literally means " worm-like work ", and has been described as one of the most demanding and elaborate forms of mosaic work.
8.
Within these panels are circular " emblemata " depicting fish and other marine creatures ( shrimp, murex, picarel, conger, sea urchin, garfish etc . . . ) in the opus vermiculatum technique.
9.
There were two main techniques in Greco-Roman mosaic : " opus vermiculatum " used tiny " tesserae ", typically cubes of 4 millimeters or less, and was produced in workshops in relatively small panels which were transported to the site glued to some temporary support.
10.
The Romans distinguished between normal " opus tessellatum " with " tesserae " mostly over 4 mm across, which was laid down on site, and finer " opus vermiculatum " for small panels, which is thought to have been produced offsite in a workshop, and brought to the site as a finished panel.
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