Weltwesen (German, lit. "world-essence") is a pilot study that followed the method of Euclid's "Elements", using 36 Definitions, a single Axiom, 3 Postulates and their substantiation with analysis-synthesis, induction-deduction, and some representative literature from philosophy, logic, mathematics, physics, biology, and psychology in order to examine the nature, structure, function, and relevance of the Absolute beyond the 'limits' of the Universe. This interdisciplinary approach resulted in the conclusion that Ultimate Reality is the Absolute, which is the 'source and sink' of all Apparent or Virtual Reality. Having met the required criteria, this tentative theory may be called: "Absolute Relativity and the Relativity of the Absolute".