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Link 1

Premise 1: Whereas one's perception of a needle-tip's hardness, shape, temperature and movement as it presses against the flesh of one's fingertip is a reflection of the actual hardness, shape, temperature and movement of the needle-tip, the physical pain associated with this event is not a reflection of any aspect of the nature of the needle-tip or one's fingertip, but is instead merely aroused by an event in the physical world: the activation of pain receptors in one's fingertip.

Premise 2: Whereas physical pain is a negative experience, like some emotions, perceptions are themselves neutral experiences which can arouse positive or negative emotions.