This conversation is closed.
There is only spin.
Energy moves at the speed of light and never slows. For us to experience it, it has to hang around. To keep moving and stay local it has to curve, This is the beginning of spin. It is also the beginning of angular momentum. Thus matter, mass, density etc., is an illusion of solidity created by semi-stable symmetric angular momentum events. There is only energy and we can only experience it as spin.