Who am I? or Who is the knower? or What is consciousness? (All the same question, roughly.) If consciousness (which we all experience intimately) is merely an epiphenomenon of the mind, which is an epiphenomenon of the brain, then there must be a physical mechanism in the brain that accounts for it. But then the same question can be (and must be) asked again: What submechanism within the broader mechanism is responsible for consciousness?