Theaetetus of Athens, Greek mathematician, c. 417-369 BC, in a mask with the face of Socrates, Greek philosopher and the founder of Western philosophy, c.470399 BC. Helmet or mask in the shape of a dolphin with head of bald bearded man, with fish tail or hair tied with a ribbon. From a jasper gem. Teteto e Socrate. Copperplate engraving by Joseph Testana after Giovanni Angelo Canini from Iconografia, cioe disegni d'imagini de famosissimi monarchi, regi, filososi, poeti ed oratori dell' Antichita, Drawings of images of famous monarchs, kings, philosophers, poets and orators of Antiquity, Ignatio deLazari, Rome, 1699.
Theaetetus of Athens, Greek mathematician, c. 417-369 BC, in a mask with the face of Socrates, Greek philosopher and the founder of Western philosophy, c.470399 BC. Helmet or mask in the shape of a dolphin with head of bald bearded man, with fish tail or hair tied with a ribbon. From a jasper gem. Teteto e Socrate. Copperplate engraving by Joseph Testana after Giovanni Angelo Canini from Iconografia, cioe disegni d'imagini de famosissimi monarchi, regi, filososi, poeti ed oratori dell' Antichita, Drawings of images of famous monarchs, kings, philosophers, poets and orators of Antiquity, Ignatio deLazari, Rome, 1699.