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I'd have to say that it cannot get much gloomier. Oedipus has inflicted a living punishment upon himself. Unlike Jocasta, he did not choose to end his life, but rather spend the rest of his life looking for things that cannot be seen.... things that we must use all of our senses to be aware of. Thus he's blind, shamed, and ultimately banished. Somehow, we can infer from the end of the story that Oedipus' life is devoid of the light at the end of the tunnel.