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830 RUGGERO MARIA SANTILLIFigure 6.3. A view of the classification of physical media permitted by the Minkowski-Santilliisogeometry first proposed in Ref. [6] of 1991 (see also Figure 8.5.1 of EHM-II and Ref. [63]).3) The direct geometric representation of the general inhomogeneity of themedium is done via a dependence of the characteristic quantities on the localradial distance r and other variables, b s = b s (r, ...) = 1/n s (r, ...). Such a localvariations can be averaged to constants for simplicity.4) The direct geometric representation of the general anisotropy is done via adifference between the space and time characteristic quantities, b s ≠ b 4 , n s ≠ n 4 .5) The direct geometric representation of the locally varying speed of light,the maximal causal speed and the other features of isorelativity are done viaIsoaxioms I to V.The above characterizations provide the following classical iso-Minkowskianclassification of physical media first presented in Ref. [6] of 1991, Section IV-10(see also Ref. [63] and EHM II):GROUP I: characterized by n s = n 4 , n 4 = 1, > 1, < 1.These media possess the same homogeneity and isotropy of space (vacuum).GROUP II: characterized by n s < n 4 , n 4 = 1, > 1, < 1.These media are inhomogeneous and isotropic with low density.GROUP III: characterized by n s > n 4 , n 4 = 1, > 1, < 1.These media are inhomogeneous and anisotropic with high density.