A Roman floor: tesserae of local stone, brick and glass pressed into mortar, polychrome or black and white. The picture sits in a central panel inside a geometric border, and the rows of stones follow the contours of the forms, a habit mosaicists call andamento.
Stone comes in a short list of colours, so the palette is earth, white, black and a little glass for blue. Floors were walked on, which is why they are stone and not the gold glass of later walls. The border was set out with string before a single tessera went down.
The figure is rasterised into a cell grid and each cell becomes one jittered stone with a grout gap. Cells on the silhouette's rim switch to dark stone so the outline holds. The banner lettering is laid stone by stone from a one-time readback of text drawn on a tiny offscreen canvas.