This mosaic dating to the I century A.D. is a copy of a Greek original made in the Hellenistic age around 200 B.C. It portrays seven wise men engaged in discussion. The identification with Plato and his school appears authorised by the consideration that all of the subjects are holding scrolls; the depiction of the globe representing the heavenly sphere and the figure holding a rod, indicate that they are discussing problems of astronomy. The globe is contained in a wooden box, though some of it is visible. The colour of the tiles used seems to suggest that the globe is made of crystal.