How does this artwork elucidate its abstract?
Plato's Academy mosaic is a free standing mosaic panel found in the villa of T. Siminius Stephanus in Pompeii. It is roughly a square, 86 cm x 85 cm, and can be seen presently at the National Archaeological Museum of Naples, where it is kept as item MANN 124545. 
Most generally it is taken to present some variation on the topic of the Seven Sages of Ancient Greece. The figures are in classical attire of toga and sandals, gathered under a tree, against a backdrop of allusive elements, including stone columns suggestive of the grand civic architecture of the age, and glimpses of distant cliffs or havens, perhaps metaphysical in nature. Since its discovery in 1897 many hypotheses about the personages and the meaning of the representation have been proposed.
Seven Sages National Archaeological Museum of Naples Pompei Naples mosaic Plato's Academy T. Siminius Stephanus Plato Pompeii