The mosaic depicts a children's version of the chariot races of the circus. In the centre is the spina of the circus, complete with the obelisk and the metae, represented as three conical columns, at each end. The four teams (factiones) are each represented by a chariot drawn by two birds of the colour of the team. The factio russata by red flamingos, the factio prasina by green wood pigeons, the factio albata by white geese, and the factio veneta by blue plovers.