How does Aeschylus use imagery in The Oresteia?

In Part IV, Clytemnestra cries out in grief; Orestes speaks sharply to her, and Clytemnestra suddenly recognizes him, pleading with him to remember that she's his mother in language that clearly echoes the imagery of her dream.

"O child, respect and pity / This breast, whereat thou often, soothed to slumber / Drained-est with baby mouth the bounteous milk"