The problem with consciousness is that we don't know how or why the some of the elements in periodic table come together to create electrical synapses that cause inner visualization, creativity, emotions, and the like. From what I've gathered it can be a result of two things. either the human while evolving eventually found psychotropic drugs like magic mushrooms (psilocybin [I think thats how its spelled]), peyote cactus, or Dimethyltryptamine, and simply "evolved" a consciousness, or as human beings we are a poly-dimensional organism. One who exists not only in a universe based on matter, and natural laws, but also an ethereal universe, based on laws of energy we still do not understand.