To continue with our journey that we have set up to travel from the absolute bottom-line level of Nature upwards, we need to have a master guidance that will shows us the way forward. What that master guidance could be? Well, there must be one, and only one, Ultimate Physical Law Of Nature (UPLON) from where every other physical law of Nature must be derived from. And this is so because of the base unity of Nature. This fundamental recognition is being vested in

The Seventh Fundamental Principle of Nature:    Nature is not disjointed, but is united springing from its common base of existence.

So how then, we can discover UPLON? In order to begin with this rather insurmountable task of tracking down the Ultimate Physical Law Of Nature (UPLON), we need first to have a full understanding of what we will be looking for. So first things first.

For starters, we need to begin by asking: What is a physical law of Nature? Well, we answer this as follows:

A physical law is nothing else but an expression of a relationship that a class of objects can establish with their environment.

A physical property of an object is the expression of a relationship that the said object was able to establish with its environment. Two or more objects are said to be equivalent modulo a property P iff (if and only if) the said referenced objects are able to establish the same relationship within the same environment. Any environment will have some physical properties and finding those properties is essential in the discovery and understanding of a physical propriety of an object or of a class of objects of a particular environment.
REMARK: Let us note that if a property of a material object is considered relative not to its environment, but relative, say, to our sense perceptions, then the study of such properties is not within the realm of Physics, but rather, at best, may be incorporated within the study of Applied Psychology and/or the study of Metaphysics. For example, if the motion of a particular material object is studied with respect to another observer (stationary or not), i.e., with respect to the sense perception of that observer (stationary or not), then this study of the human sense perception with respect to the stated observer is a study which lies outside the scope of Physics belonging, at best, to Applied Psychology and/or Metaphysics. But if the motion of the same material object is studied with respect to its environment, then it is the responsibility of Physics to study the physical properties or physical phenomena that can be derived from the said motion.
. The most useful and general way of looking at a physical law is to look through its objective, aim, or mission, if you will. If the UPLON is to exist, then all physical laws of Nature that are derivative from UPLON must have their underlying objective in concert with the one of UPLON. In other words, no physical law of Nature can be in conflict with the underlying objective of UPLON. We mark this fundamental recognition as . The Eight Fundamental Principle of Nature: In Nature, no physical law can be in conflict with UPLON.

The only physical law that we have encountered so far was the renormalization property of XF vested in the DownState Law (DSL) that states that when left unconstrained XF always has the tendency to decompress to the XB state. This tendency can be construed as an objective of the law and, when we view it in that way, through that vista, then we can have this formulation:

.	.	The objective of the DSL is that of flattening (or leveling down) XF to the "XB-line."
How the objective of the DownState Law (DSL) can be accomplished?
.		The accomplishment of the stated objective can be done in one, and only one, way: by "stretching" XF until it reaches the XB-state, that is of stretching the XF-volume until its density is that of the xenobase.
.		REMARK: In the DownState Law (DSL) the "object" is a XF-block and its "environment" is the vacuum-space. The "relationship" between the object and its environment is expressed in the renormalization property of the XF state.
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.	.	The idea now in finding UPLON is quite straightforward: substitute in the DSL the XF-block with the xenocomb keeping, of course, the same objective in place. The new law, that we call the DownLevel Law (DLL), will state its objective as that of leveling down the xenocomb's level to the level of the xenobase (XB). And this must be the UPLON !!!
		REMARK: The Eight Fundamental Principle of Nature, in terms of DLL, can be expressed as follows:
.	.	In Nature, no physical law can be in conflict with the DownLevel Law.

How the objective of the DownLevel Law (DLL) can be accomplished?

The answer to this is considerable more complex, as we need to introduce some new definitions and concepts.

Definition 1. We call xenolevel of a xenocomb its quantity of XS per its volume.

REMARK-A: This xenolevel concept is a generalization of sorts of the density concept and when we have an object that is composed only of an homogeneous mass of XS, then the two concepts, xenolevel and density, are synonymous being one and the same. On the other hand, when an object is composed of a non-homogeneous XS and/or with vacuum "holes" in it, then the only meaningful concept for that object is its xenolevel and not its density.

REMARK-B: The xenolevel "lines" of XB, XF, and XR blocks are of course given by their respective densities , , and .

Definition 2. An object is said to be a xenoheavy, xenolight, or a xenoflat, if their respective xenolevel is greater, less or equal, respectively, than the xenolevel of XB.