People give ambiguous, confusing and overlapping definitions to “the Universe” and “Nature.”
GUTUL says the Universe is made of substance and space. Substance is made of particles. Space is made of force fields where a matter made of particles acquires its properties and is, hence, a “property space.” (See Table 1-2.)
The Universe is therefore made of a material world (MW) and a natural world (NW). The material world is often loosely called the Universe; the natural world is loosely called “the Law of the Universe,” “the Nature of the Universe,” or even “the Law of Nature.” The natural world of the Universe is Nature and Nature is symmetry or “change in form without change in nature.” Symmetry underlies all the laws of conservation in Physics.
The material world (MW) or the material aspect (or substance) of the Universe is “xxx being as itself” and the natural world (NW), Nature or the natural aspect (or property) of the Universe is “xxx being in itself” – where “xxx” is a variable or a placeholder to which one can put anything in its place.
So, the only meaningful topics about the Universe are,
(1) xxx being,
(2) xxx being as itself, and
(3) xxx being in itself.
Forget about the meaningless “xxx being for itself.”