Nature’s harmony is around us and within us at all times. Perceiving it is an occasion for great happiness; but it is often only appreciated in retrospect or in its absence. If all is going well in the body, it tends to go unnoticed. Your lack of a headache is not front-page news for your cerebral cortex. Abilities such as walking, seeing, thinking, and peeing take care of themselves, and so blend into the landscape of automaticity and unawareness.