“…On one hand, it imitates or even vies with its referent, the object, the shield: it is a medallion, a verbal equivalent of a visible object. On the other, it is a miniature replica of the entire poem, inside it (i.e., a mise en abyme); 29 hence, it is an enunciative and metadiscursive configuration, a "secondary screen" or a screen within another screen, in Christian Metz's terms. 30 On a still higher level, the shield is a device that serves to shape, frame, and organize the whole world: Oceanus surrounds it, as it frames the Earth itself and the maps of the oecumene.…”