BW: Of course, I have no problem distinguishing matter from the motion of matter. Our disagreement persists on the issue of "perfect" matter, which we've discussed extensively in the past.
>... Like all idealizations, solid matter and empty space do not and cannot exist. ...
BW: We agree that all known *compositions* of matter consist of physical components in motion. It took a long time to discover that a "perfectly solid" rod of iron is composed of atoms in motion. It took longer to discover that the atoms themselves are not "perfectly solid" objects, but are compositions of smaller physical particles in motion.
My proposition is that there are even smaller particles of mass that compose those sub-atomic particles. So, it's no surprise to me that you would be skeptical about those particles (Unimids) being "perfectly solid" objects. Even if they are not, I think the Unimid Theory explains a host of problems common in quantum particle theory.
However, our dispute is primarily philosophical. My position is that no matter can be in motion unless there is space where that matter does not exist. If all space is occupied by matter, no motion can occur.