  The group of automorphisms of the \(n\)-dimensional number space  contains only the identity map, since all numbers of  \(\mathbb{R}^{n}\) are distinct individuals. It is  essentially for this reason that the real numbers are used for  coordinate descriptions. Whereas the continuum of real numbers  consists of individuals, the continua of space, time, and spacetime  are homogeneous. Spacetime points do not admit of an absolute  characterization; they can be distinguished, according to Weyl, only  by “a demonstrative act, by pointing and saying  here-now”. 