Pella Mosaic, originally uploaded by Matthew Whitaker.

Mosaic Art Source mosaic definition:

mosaic-opus lapilli “hunting a lion” – opus lapilla – mosaic detail

opus lapilli – mosaic consisting of small pebbles of many natural colors, one of the first types of paving. ex. Hunting a lion – pebble floor, 4th century BC, Pella (Macedonia) Pella Museum

Mosaic Art Source – pebble mosaic images archive