The third solution is to be found in Crouse and Skufca (2019), which presents an interesting synthesis of the two previous proposals to solve the distance function problem. What they suggest is a kind of physical interpretation that makes three things possible. Firstly, it allows to determine the lowest sizes for hodons and chronons in terms of Planck length and time. Secondly, it suggests a definition of the distance from A to B in terms of the distance travelled by a “test” hodon (in discrete minimal steps, of course). This solves immediately the anisotropy problem as no directions are privileged. Thirdly, it does not suppose the a priori existence of a grid (or a similar structure) as an absolute frame of reference. This opens up the possibility to reformulate special relativity theory, which they do. Although Silberstein’s approach (see section 2.4 above) is not mentioned, it is clearly related and can be considered to be an improvement, as the physical basis is philosophically better motivated.