Paul Klevgard has written the seminal snapshot of a core analysis of quantum and relative physics, from an intuitive ontological point of view. He's achieved what everyone over the last 100 years has attempted and failed to do. Not only does this little volume easily explain what's been missing in quantum uncertainty, but what has otherwise been very clouded and unclear about real, rest and relative mass. Paul takes all the major entangled issues and makes them clear through a simple dialogical style, reminiscent of Socrates and Plato's dialogics.
Klevgard removes the pluralistic relative nonsense that's surrounded, not only physics, but philosophy and mathematics as well, by showing clearly where relativity belongs, and where real rest mass exists. He separates space/time into space(extensional dimension) and time(progressional dimension), which offers the clearest examples/analogies/explanations I've ever seen, even clearer than Einstein's own. The use of ontology as vehicle of explanation compares only to Charles Sanders Peirce's use, to make the complex, simple, yet scientifically factual.
If you've ever wanted a clearer explanation of Lorentz/Einstein transformations of mass to energy, and energy to mass, then buy this little jewel. It's well worth far more than the cost...