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At the end of that, the whole matter lands on a scenario where the (vacuum) physical space turns out to be, at a quantum level, a discrete kinematical object woven on a lattice made of 4-valence nodes with certain spin properties, being hence nothing but quantum tetrahedra that enclose all the geometric properties that one expects quanta of space to have. The gravitational field is so kinematical depicted quantumly by such spin tetrahedra representing its quantum states, within which one can measure areas, lengths, volumes, angles, by treating all these geometric features as quantum observables of a Poisson system modeling the classical tetrahedra geometries, in a perfect first-quantisation flavor.