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\subsection{The Universe's spacetime field}  The particles walking across the universe are structured like coupling of chains of intrisic quantum oscillators, belonging to the basic field $\Xi$.\\  The birth of massive particles in the scalar field $\Xi$ $\Xi_i$  of the object-universe or the bird of $\underline{\Xi}_i$-lattices means that the universe can be expressed by $\Xi$ or by $\underline{\Xi}$.\\ The field that represents the universe as a spacetime object, that we call \emph{universe's spacetime field}, is generically denoted by $\underline{\underline{\Xi}} \equiv (\Xi, \underline{\Xi})$.\\  But we must not believe that $\Xi$ is a sort of elastic \emph{ether} pervading an absolute space: we remember that this has been refuted by the theory of relativity, because it is itself the spacetime.\\  Remembering that coupling massive introduces a local FR $\Sigma_0$ with a \emph{motion} in the proper time $\omega_0$ and the birth of a \emph{spatial dimension} $\not \lambda_0$, then we can consider the universe as set $\Sigma_U$ of the local reference frames $\Sigma_0$, associated with massive particles.\\