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He wants to touch his father's head, touch the sign of his father's mortality,
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the fact that his father is growing older.
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He sees in his father's body his own face, hands, voice,
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and we can feel that with him.
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And then, when he flees from that scene, finally, and soils himself,
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he becomes another one of those abject characters.
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And he goes to hide under a pier, finally bathes in a river at night.
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This kind of detail gives us two things:
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both the beginnings or another iteration of the reason
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why he becomes who he becomes, the drunk, the rapist,
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but it gives us more than that.
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It gives us a sense of his complexity.