How does Sophocles use imagery in Electra?

The imagery is consistent with the era and Ancient Greek mythology. The play opens at dawn in Mycenae, where Paidagogos and Orestes stand before the palace of the slain Agamemnon, discussing how best to revenge the murdered king. The god Apollo instructed Orestes to seek revenge, not by "shield nor army" but "secretly" and with his own hand. Orestes plans to have Paidagogos enter the palace carrying an funeral urn full of ashes and announce that Orestes has been killed in a chariot race.