This book examines the fundamental basis of 'reality, ' in all of its manifested forms, whether or not experienced by humans. Explored are what there is to know; what it is we are capable of knowing; what makes such knowing possible (theoretically, technologically, anatomically, physiologically, etc.) ... and ... perhaps more interestingly, clearly identified are what it is we are not capable of knowing: why we can never know these things, and what this inability means in terms of how we perceive the world around us in all of its various forms. These include physical, chemical, political, social, economic, religious, cultural, and other manifestations of "reality" -- all of which, as is shown, derive from a common set of fundamental attributes ... denominators that are 'common' to all realizable forms of energy, and hence, form the basis for a 'Unified Theory of Everything." Having discovered this, one is able to explain the essence of everything ... or, at least, know what to look for in seeking meaningful knowledge. Indeed, the search for knowledge, and through it, truth, is among the strongest of all human drives. As a part of this search, we constantly seek common denominators ... basic attributes that can help us, in some generic sense, gain further insights into the fundamental nature of our universe, and how it becomes manifest in our daily experiences. Indeed, this book explores how we perceive the world around us, and how we build those perceptions into a body of knowledge. The quest for such knowledge ... the journey ... may be an end in itself for - given our own anatomic, physiologic, technologic, analytic, sociologic, political, and other constraints and limitations - the ultimate objective may very well be unattainable. That having been said, however, our continuing efforts to improve life on this planet is an attainable goal ... so, to that end, we strive to learn more, to understand more, to accomplish more, and to keep expanding the envelope of our abilities and understanding.