Ekphraseis of works of art exist at several levels. There is the physical, observable reality of an object or objects, or the potential for such. That (potential) reality may then be depicted within a work of art. A literary artist imaginatively (re-)presents that depiction, in the ekphrasis itself, and may further imbue the resultant description with a symbolic value for the story in which it is set. Not all of these layers need exist, nor need the correspondence between them be precise or even real. An ekphrasis, for example, may describe a completely fictitious object, which itself, however, reflects a possible actuality in the physical world of the senses. Or the question of symbolic value may appear irrelevant, if the purpose of the ekphrasis is instead to provide relief from the temporal drive of the narrative.
This paper seeks to elucidate the two surviving ekphraseis with astronomical content from Euripides, one from his Elektra describing a shield of Akhilleus, and the other from his Ion describing a ceiling tapestry. I take the view that if we can discern and then understand a potential reality described in an ekphrasis, then it is worth asking whether this reality helps us to understand better the literary image and hence its possible symbolism too. The need to answer such a question is the greater with regard to texts involving astronomical material, as this tends to lie outside modern readers' experience or knowledge, but lay well within the day-to-day experience of people in antiquity.