Sources with different details for the same myth are characteristic of Greek myth, which is rooted in oral transmissions. Notice that in Ovid's tale Hera does not dispatch the ghost of Argus to torment Io as a gadfly. Hera calls upon a Fury as she does in an episode in Virgil's Aeneid that recounts Hera enlisting a Fury to torture the wife of Latinus. In Prometheus Bound, Argus is the child of Gaia, but Ovid is silent on the issue of Argus's lineage. While Ovid and Aeschylus give Argus one hundred eyes, other traditions, according to Pierre Grimal, attribute one eye or four eyes to the monster Argus. Just as there are differences in the literary preservation of this myth, representations of Argus in the plastic arts may differ. For example, Ovid describes Argus with one hundred eyes in his head, but an Attic vase (c. 490 BCE) depicts Argus with eyes all over his body (Powell 375).