What does physics show us?
At the deepest most fundamental level our convential notions of matter and atoms as individible particles which are innert and insensate (the billard ball notion of reality) is wrong.
fundamental particles behave as both a wave (without a medium) or as a particle (whose postion and velocity cannot both be know).
The design of the experiment determines what you see.
In fact one might better speak of quantum events than quantum particles and many physicists do.
So what is the fundamental nature of reality? Matter? What is matter?
A wave? A particle? An event?
And then there is the problem of action at a distance, quantum entanglement, coupling, pairing an effect that seems to occur fasting than the speed of light and without any form of direct communication?
We do not know what fundamental reality is but we do know that our prior conceptions of it are wrong. Time for speculative philosophy or metaphysics?
I like the speculative philosophy of Alfred North Whitehead (philosopher and mathematician) (process philosophy) a lot!