He's really sort of the devil. He's completely emotionally detached. He has no empathy. You find that in psychopaths. It's about power with Voldemort. It's an aphrodisiac for him. Power makes him feel alive.
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Just as Pollock used the drip to meld process and product Richter 'found' and used the smudge and the blur to ravish the eye creating works of psychic and physical power.