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The velocity $c$ is not described by spatial or temporal characteristics, that are relative, and so it could assume the \emph{absolute} role of \emph{structure constant} of the physical system constituted by the electromagnetic field and spacetime.\\  In this way the close connection between particles and ST lead us to affirm that particles \emph{express} the object ST and vice versa.\\  At this point, we must note that the relations (interactions) between particles determine the fundamental characteristics that we denote, in epistemological terms, like time and space, and, in experimental terms, the measure of time (with a clock) and space (with a ruler) in a given reference system consisting of objects. In this way the ST is deeply rooted in what we refer as particle-fields.\\  Let us now to recall that in electrodynamics the interactions between two electrons is meadiated by a mediator (the electromagnetic field), and it is expressed by reciprocal \emph{influences} (coupling) between the particle and the mediator. So while considering that the electron is a fermion (a spinor $\psi_i$) and the photon is a boson (a 4-vector $A_\mu$), we must admit a common basic structure of the respective oscillators field that allows the \emph{coupling} between fermions and bosons: in this way we intend that there must be a connatural structure between fermion (agent) and boson (inetrmediary agent). Estending this common and \emph{innate} basic structure to any kind of interaction, we may assume that all the particles can be considered as different empirical expressions (or physical states) of a single, basic \emph{object-field} (see the processes of pair creation and annihilation).\\ annihilation). We call it \emph{Structure ipothesys}.\\  So we say that the universe is an \emph{object} whose physical nature is to be a \emph{field} from which emerge the different particles like articulated structures of \emph{basic oscillators}, while the spacetime, that is their latter, is the fundamental structure of the \emph{universe-field}.  %  \subsubsection{The intrinsic quantum oscillators}\label{iquo}