Noting that the method in Section 1.4.2 derives from a molecular vibration physical picture, then every configuration within a contiguous generic symmetry region of the configuration space will exhibit vibrational normal mode of the same symmetries. It then follows that a single polytope species can stand in to represent all configurations within that region. This transformation of a continuum of configurations into a singular representation we call the discretisation of a configuration space. For convenience, we place the representative polytope at the centroid of its region as shown in Fig. .