Hierarchy classification:

1. top of the aat hierarchies
2. Activities Facet
3. Processes and Techniques (hierarchy name)
4. [processes and techniques by specific type]
5. [additive and joining processes and techniques]
6. [surface covering processes and techniques]
7. inlay (process)
8. mosaic (process)

Anotations

Scope note:

Standard mosaic process and technique using small cubes of uniform size known as tesserae, made of hard materials such as stone and glass, applied to a ground to form ornamental patterns and pictures. While opus tessellatum was initially a cheap substitute for finer mosaic work executed in the more complex technique of "opus vermiculatum," it eventually became the dominant technique and remained so throughout the Middle Ages.