@north,
North,
Consider this.
Billions of dollars are being spent at CERN (the particle accelerator site) to try to account for what we call "mass", or what the layman might call "stuff" or "substance". That means that the use of the term "fundamental" as in "fundamental particles" is
relative to particular experimental procedures, and theoretical explanations, but is in no way the "last word" with respect to what we call "reality". To understand the philosophical implications of this you simply need to ask whether there can
ever be a "last word", and you can trace a "no" answer from at least as far back as Kant.
This is why your original statement "there
is a fundamental reality" which you specifically couched in
physical terms is either vacuous, or a matter of belief.
Now as JLN and I have indicated, there
may be a level of awareness or vantage point, from which the vacuity of statements such as yours can be "understood".
That hypothetical and ineffable state might be termed "fundamental" or even "transcendental", but whether it is a matter of "greater depth" or "the bed-rock" of what might call "consciousness of reality" , cannot even be asked, because
asking involves slipping out of that state to the level of
usage of words..
(Note that the second paragraph is not required for your understanding of the first).