"How do we know anything? Some say that we only know about external reality through perceptions, analysis and thoughts about these perceptions. But, can we know intuitively through an entirely different process? Is creativity and genius in science an internal understanding from another source of knowledge? (Internal discovery of mathematical principles as physical reality, rather than as an invention such as sculpture.) Or, is it based only upon thoughts about perceptions that are from sensory data? Is it possible that an expanded mental state such as self observation alters perception? "