At the very least there are 35 fundamental elementary particles. These are the ones that are observed or circumstantially observed by high energy experiments. The six quarks flavors and their three color constituents total number 18. The six leptons (electron, muon, tau, and their neutrinos) total number 6. The bosons: photon, 8 gluons, W, and Z total number 11. If their anti-particle partners are included then there are a total of 70 elementary particles; if the unobserved ones: graviton, Higgs boson, and magnetic monopole are included with their anti-partners then the total number of elementary particles increases to 76. 76 particles made up 76 realities. However, the question is which of these are truly free? This implies freedom of association, multiplication, division, and dispersion.

The best candidate, of course, is the photon. It has zero rest mass hence gravitationally free. Since it is a boson, two differently spacetime located photons can have exactly the same quantum numbers and independent of Pauli Exclusion Principle. Nevertheless, the best indication of absolute freedom for the photon is its maximum speed. It can always travel at the fastest speed of the universe. Lastly, a photon not interacting with any other elementary particles can said to live forever.