Simple, very natural, spatial (three-dimensional) function of ether density is - according to suggesting theory - the only one primary essence of Nature; this function creates something like unified wave system. Globally - capturing the creation at whole - this system produces infinite pyramid of nested black holes. Every such black hole is a certain volume "on some level", consisting of both its own black holes and its own ether. Our universe is a photon (black hole) of elder universe, and our ether is part of this black hole. Photon in our universe is a black hole and self-universe like ours. Periodically arising "problems" of heat death and gravitational collapse are resolved by Big Bangs (on every hemicycle of photon motion). Locally - considering our universe - unified wave system produces observing by us secondary essences: matter, motion, gravitation, electromagnetism, strong interactions, phenomena of uncertainty and relativity. The theory considers ways and mechanisms of production and functionality of main physical essences of universe. Little more attention is paid to nature of gravity and wave-particle nature of matter - for elimination of existing logical contradictions and misunderstandings; theory supports "gateways of junction" between formal logic and quantum mechanics. Considering of essences has neither mathematical nor philosophical, but conceptual-physical form. Modern physics suffocates from essences, and this theory is consistent implementation of Occam's razor.