“The spectacular advances of modern science have generated a mindset that makes potential limits to scientific inquiry intuitively difficult to grasp. Again and again we are given examples of seemingly insurmountable problems that yield to previously unimaginable answers. Just as some physicists believe we will one day have a Theory of Everything, many cognitive scientists believe that consciousness, like any physical property, can be unraveled. Overlooked in this optimism is the ultimate barrier: The nature of consciousness is in the mind of the beholder, not in the eye of the observer.”