The paradox of Gabriel's horn.
Modern physics only says how stuff work. Do this, that happens. That sort of thing. The electrons might be doing what the protons are said to do or the other way around. For every wave there could be a hidden particle. We don't need pilot theory to know this, but if that's works for ye that' fine. My point is much of what QM says is false because they are clothing their findings in the language of an unprovable philosophy. They can predict things, but that is all QM can do.
As for matter, it's spatial? Yes. Is all space infinitely divisible? We can't conceive it as discrete, so our natural lights say yes. So your computer is infinitely packed. This is intuitive for me at least. That objects are in a sense very finite is also true, but General Relativity goes well with infinitely parted objects in the sense I mean that. GR is a great theory, and not just because it has my initials
:) Lastly, there are different kinds of density and ZP is about the relationship between volume and mass. Until you grasp this you'll be in the dark of QM topology