Christopher Nolan’s The Odyssey has just been released, but months before it was out, its casting had already acquired the texture of an internet morality play. There is something deliciously ironic about watching audiences invoke the sanctity of historical accuracy to defend a woman who, according to legend, hatched from an egg.Casting Oscar winner Lupita Nyong’o as Helen of Troy inspired the predictable chorus: she could not have been dark-skinned. Even Elliot Page’s casting provoked another cycle of outrage. Is he playing Achilles? How can a trans man play the golden boy of Greek mythology? Then, the internet found out he was playing a Greek warrior, Sinon, and yet the...