Yes, perhaps my model will seem a little unexpected, but it is very simple, even a schoolchild can understand it. Let's play a game called "create your own Universe". So, let's begin. Our Universe is basically structured very simply, there is only one fundamental law in it, let's call it the "Law of Equilibrium". We have a space, which is an absolute vacuum in which various macro and micro objects exist, but they all ultimately consist of indivisible fundamental particles. Particles always try to fill the vacuum and balance themselves. In this case, various combinations of other, already composite particles are created from fundamental particles. To classify particles, we have one simple parameter: all massive particles are composite, closed, and contain a vacuum inside themselves - for example, an electron, positron, proton, neutron, etc. If a combination of particles is stretched into a string and is not closed, then this particle is massless - for example, a photon and a gluon. Photons are vibrations of such strings that permeate all space and are always tied to some "vessel" with a vacuum, and the role of such "vessels" is played by atoms, of which massive objects consist. It is in them that streams of particles rush, forming a semblance of strings. These strings are the cause of gravity, pulling space objects together. When such macro-objects collide in space, the strings also vibrate, therefore the speed of electromagnetic and gravitational waves are equal. Gravity itself exists constantly as long as there are strings pulling objects together. Let's return to particles: there is another parameter for them. Particles that are called negative are expanding particles, for example, an electron. And those that, on the contrary, are compressed, such as a positron or a proton, for example, we call positively charged. If we connect a positron and an electron, we get an elongated string - a photon. It no longer has either mass or charge. When the position of any particle in a string changes, all other particles also change their position simultaneously, because the equilibrium is disturbed. This is the whole solution to the long-range action, which Einstein called "spooky". As you can see, there is nothing spooky, everything is explained simply. What else? Yes, atoms. Quarks in atoms constantly exchange fundamental particles. The particles are stretched into a string between the quarks, and we see a massless gluon. It is also easy to guess how the atoms themselves coexist with each other. They exchange particles, and we see this as electrons constantly changing orbitals. Because of this constant movement in the atoms to which the strings are "tied", the space, which is permeated by all these strings, seems to "tremble". Because the vacuum points are constantly shifting. Well, this is approximately what the Universe consisting of fundamental particles looks like. Just as you wanted.