These decorative circles of various types of stone are hand-crafted by Italian artisans who use many of the traditional techniques such as intarsia stone inlay as well as taking advantage of new water jet technology.
There are several great architectural examples of the early intarsia method found in St. Peter's Basilica in Rome as well as fifteenth century Florence buildings.
The intarsia inlay method is used with both wood and stone.
The rich and beautifully executed intarsia work may be due to Baccio Pontelli.
Here was what seems to have been the basement of a very large hall or " Megaron," approached directly from the central court, and near this were found further reliefs, fresco representations of scenes of the bull-ring with female as well as male toreadors, and remains of a magnificent gaming-board of gold-plated ivory with intarsia work of crystal plaques set on silver plates and blue enamel (cyanus).